Augustine is more substantial (and saintly) than August, less pretentious than Augustus, and, along with its nickname Gus, is definitely a viable choice. 
 Augustine is actually the diminutive form of Augustus and achieved its fame via the great fourth century saint, St. Augustine of Hippo, whose teachings and writings had a great effect on early Christianity.
 A major character in Uncle Tom's Cabin is Augustine St. Clare. The full name of the author of Ulysses and Finnegans Wake is James Augustine Aloysius Joyce.
 Model Linda Evangelista chose the French form Augustin for her son, also used by Jerry Hall and Mick Jagger as a middle name for their son James.
 The Spanish Agustin is experiencing a wild burst of popularity in South America: in recent years it has been the number one name in Uruguay and in the Top 5 in Argentina.

Augustine

The feminine form of German and <a href="https://nameberry.com/baby-names/162/french-names">French name</a> Augustin, ultimately derived from Latin Augustus. Names with the -ine ending are considered chic in France at the moment; Augustine re-entered the French top 500 in 2009 and is climbing fast.

One of the surname names for boys on its way to becoming unisex, this name broke into the Top 1000 for the first time in 2013 for girls. While it sounds masculine to us, because of its two-syllable er-ending sound so trendy with <a href="https://nameberry.com/boys-names">boys’ names</a>, many parents apparently disagree.

Carter

Casimir, a traditional name of Polish kings, could do quite well these days as we see the rise of Caspian, Cassius, Castiel, et. al. Like Leopold and Laszlo, Casimir is strong and worth considering if you've got an adventurous streak — and bet your son will too. An alternative commonly cited meaning that modern parents might prefer is "proclaimer of peace". The traditional Polish spelling of the name is Kazimir.

Casimir

Rugged but gentle at the same time, Cassian is a saintly and stylish choice that was derived from the name Cassius. Before 2017, it was an obscure choice, given to a tiny handful of boys each year. As of 2023, however, it's become one of the top ten fastest-rising names in the US, more than doubling in usage since 2022 and edging closer towards the Top 500.
 There are a number of fourth and fifth century St. Cassians, one of whom is the patron saint of stenographers (though he must not get much work these days).John Cassian was a monk and ascetic writer who introduced Eastern monasticism into the West; Cassian Elwes is a British film producer, and Patrick Wilson used the alternate spelling Kassian for his son.
 It is unlikely however, that any of these can be credited for the rise of Cassian. Instead, we must turn to pop culture.
 In 2016, just before Cassian began to climb the charts, the Star Wars Franchise movie, Rogue One, was released and included a character called Cassian Andor, who then went on to feature as the lead in the television spinoff series, Andor. With the sounds of popular Julian, Jasper, and Adrian, like Casper but not too ghostly, Cassian caught people's attention, not just in the US, but in the UK, where it now ranks in the Top 600.
 
But what caused the even bigger leap up the charts in 2023? Again, we must look towards a fictional character. The popular romance-fantasy book series A Court of Thorns and Roses by Sarah J. Maas features a Cassian, and the latest novel included a Cassian storyline that likely put the name on people's radar. "ACOTAR" as it gets called is popular on BookTok and BookTube so it's no wonder parents are taking inspiration from it. 
 Similar to Nameberry favorite Caspian with sounds that are both strong and soft, both ancient and right up to date, Cassian is a hot name right now, and was given to more than 550 babies in 2023.

Cassian

A royal name in ancient Egypt that's never quite made it to the modern world, though nickname Cleo is widely used.  Other now-extinct Cleopatra diminutives, including Cleora and Cleola, achieved some popularity in the early 20th century when there was a crazy for all things Egypt-related as the ancient tombs were opened and artifacts displayed.  In the US, Cleopatra became a popular silent film in 1917 starring Theda Bara.

Cleopatra

Conrad has a somewhat intellectual masculine image, a solid name that has been consistently on the popularity lists, especially well used in the 1920s and 30s, and given a pop of rock energy by the Elvis-like character of Conrad Birdie in Bye, Bye, Birdie--("We love you Conrad, oh yes we do!").
 Conrad has been both a saints' name and a German royal appellation. One of its most well-known bearers is hotelier Conrad Hilton, great-grandfather of the Paris generation. Conrad was the prototypical Byronic hero of his poem "The Corsair." There have been fictive Conrads on shows like Weeds and CSI.
 Corrado is the attractive Italian form.

Conrad

Elliot is another traditional <a href="https://nameberry.com/list/79/boy-names-for-girls">boy name used for girls"</a>, a trend led by political commentator George Stephanopoulos and his actress wife Ali Wentworth. 
 Variously spelled Eliot, Elliot, Elliott and Elliotte (used by Marla Sokoloff), its star is definitely on the rise for girls. Bonus for girls is cute and feminine nickname, Elle. And many parents, of course, choose Elliot to get to the trendy short form Ellie or even Ella. At this point, Elliot has become one of the most popular <a href="https://nameberry.com/search/unisex-names/e">unisex names starting with E</a>.
 Dr. Elliot Reid was a female character on Scrubs.

Elliot

Fallon is one of several boyish surname names introduced in the over-the-top 1980s nighttime soap Dynasty: they sounded cutting-edge at the time, but no longer.

Fallon

Genevieve is derived from the Germanic medieval name Genovefa, or Kenowefa, which consists of the elements kuni, meaning "kin", and wefa, meaning "woman." The medieval saint Genevieve, patroness of Paris, defended the city against Attila the Hun through her rational thinking, courage and prayer. 
 
Genevieve is a perfect choice for anyone who wants to retain the gen sound but is tired of all the overused Jen names. It is both dainty and substantial and can be pronounced either GEN-uh-veev or the French zhahn-vee-EV. 
 
Genevieve is undergoing a real revival—it's currently enjoying its highest popularity ranking since the 1930s.

Genevieve

Guinevere was the name of the beautiful but ill-fated queen of Camelot, for so many years eclipsed by its modern Cornish form Jennifer. Today, Guinevere could be a cool possibility for adventurous parents intrigued by this richly evocative and romantic choice.
 Guinevere shares the attractive short form Gwyn with Gwyneth. Other cousin ideas: Gwendolen, Genevieve, Jenna, or Gwen.

Guinevere

Despite a return to such feminizations of male names as Josephine, Clementine, and Theodora, starchy Henrietta has not made it into that group. Still, if you look hard enough, you'll see that Henrietta has the same vintage charm. 
 The name arrived in England in 1625 via King Charles I's wife, the French princess Henriette Marie, who became known as Henrietta Maria. Her daughter shared her name but was known as Minette.
 It has been prominent recently through the bestselling book The Immortal Life of Henrietta Lacks, the story of the poor black woman whose cells became one of the most important tools in medical research. Henrietta Szold was a U.S. Zionist leader and founder of the Hadassah Women's Organization. 
 Henrietta has a number of charming vintage nicknames, including Etta, Hetty and Hattie.

Henrietta

This form of Agnes, Ines has always been popular since the true story of the thwarted lovers Queen Ines of Castro and King Peter of Portugal. This has to be one of the most heartbreaking and bloody true romances in history!

Prince Peter fell in love with the beautiful and lovely Ines, but their relationship was forbidden by his father King Afonso. Peter (who had been married) became a widow and planned to marry Ines, but this too was disallowed. When Peter followed her into exile, Afonso ordered Ines to be murdered in front of her own child. Distraught, Peter hunted her murderers down and ripped the hearts out of their bodies, claiming they did not have any hearts. When he later came to the throne, Peter made Ines his queen, exhumed her body and made the court vow allegiance to her.

Ines recently achieved new prominence in the US as the name of the second daughter of actors Blake Lively and Ryan Reynolds.

Inez is the Spanish spelling.

Ines

Sophisticated Gallic version of Lucian, Lucien may appeal to parents attracted to this meaning over that of Lucas and Luke, which have a different root, and also looking for a more unusual choice. Lucien joined the US Top 1000 for the first time in 2023, given to over 200 baby boys.

Lucien

Lucienne is a soft and ultra-sophisticated French-accented option in the Lucy family, one that could provide a fresh alternative to such fatigued Gallic choices as Danielle and Michelle.
 So if you're looking for a more elegant take on Lucy, this could be it. The original male Lucian is a Latin name while Lucien is the French form and Lucienne is a female spin on that.

Lucienne

Odette is the good swan in Tchaikovsky's ballet Swan Lake, a role for which Natalie Portman won an Oscar ---and it would make a particularly soigne, sophisticated yet upbeat choice, unlike some of the more dated other 'ette'-ending names. 
 Odette de Crecy, is the flamboyant wife of Charles Swann in Proust's A la Recherche du Temps Perdu. 
 The name became publicized during World War II via the courageous French Resistance heroine Odette Brailly, who risked her life to supply information to the Allies, was captured by the Germans, and wrote her story which was retold in an eponymous film.
 Actor Mark Ruffalo chose Odette for his daughter. 
 Variant Odetta is associated with the folksinger who was one of the first to go by a single name.
 Odile, who is Odette's evil Swan Lake twin, gives her name a sinuous, sensuous appeal.

Odette

Orlando, the ornate Italianate twist on the dated Roland, with a literary heritage stretching back to Shakespeare and before, has appealing book-ended o's, and is open to combination with almost any last name, a la British actor, Orlando Bloom.
 Orlando has an impressive literary résumé, including the poem "Orlando Furioso,", Handel's opera "Orlando", Shakespeare's As You Like It and Virginia Woolf's gender-bending novel. Most recently, Orlando was a character in The Wire.
 Orlando Bloom's name was inspired by that of the sixteenth century composer, Orlando Gibbons. It is also the first name of several outstanding athletes--including Orlandos Woolridge, Cabrera and Cepeda, and is, of course, a place name, home of Disney World in Florida.

Orlando

Sawyer is a surname with a more relaxed and friendly feel than many others, and is one of the hottest occupational names right now, with the Nameberry seal of approval. Sawyer is becoming one of the <a href="https://nameberry.com/unisex-names">top unisex names</a>. Both Sara Gilbert and Diane Farr used Sawyer for their daughters, while it was given a boost as a boys' name by the character Sawyer on Lost, an alias for the character really named James Ford. 
 Kate Capshaw and Steven Spielberg were among the first to discover Sawyer when they used it for their son in 1992, the year it leaped up 356 places. 
 Sawyer is a relatively common surname--think Tom and Diane. It originated as an occupational name for a woodcutter, otherwise known as someone who worked with a saw.

Sawyer

As commonly heard in Rome, Italy, as Steve is in Rome, New York. With the accent on the first syllable, Stefano has a lot of charm.

Stefano

As a Japanese name, Suki has the sweet meaning "loved one". It's also an English diminutive of Susanna, making it a creative and modern way to honor a Susan in your life.

Suki

A particularly charming spin on the original, as is the<a href="https://nameberry.com/baby-names/161/spanish-names">Spanish name</a> Tadeo. It debuted in the US Top 1000 in 2016.

Taddeo

daisydaisy's list "Glitzy and Fabulous" of 21 great name ideas: Augustine - Taddeo!

Glitzy and Fabulous

If I were a celebrity, these would be my baby names / names belong to the children of very influential people.