Acacius is a Latinized form of the Ancient Greek Akakios and can be interpreted to relate to the same root as the name Acacia, for the thorn bush, or Akakios which means "not evil."  With the modern taste for ancient names that end in "us," this obscure but attractive choice may have a chance of new life.  Acacius is the name of three early saints.

Acacius

Rarely used, and for good reason. Alonzo is a preferable choice.
 Alphonse does have a mixed bag of notable namesakes—French novelist Alphonse Daudet, painter Alphonse Mucha, and it was the birth name of gangster Al Capone.

Alphonse

Anne, usually seen as a girls' name, is also attested as a boys' name - for example, Anne de Montmorency, who was a French soldier, statesman and diplomat. He became Marshal of France and Constable of France. It is also a Frisian male name deriving from the element arn "eagle", as in Dutch author Anne de Vries.

Anne

Rarely heard in the US, Auberon has a gentle autumnal feel rare in a male name. Possibly starting as a pet form of Aubrey, it was also infuenced by Oberon, the king of the fairies in Shakespeare's A Midsummer Night's Dream.
 The most famous bearer of the name is British journalist and critic Auberon Waugh (whose grandfather was Aubrey and whose nickname was Bron), of the literary Waugh clan.
 The Oberon spelling is another recommended option.

Auberon

Alma

As Bas, it's a popular name in The Netherlands, but Baz, as in director Luhrmann, has potential for independent life too.
Curiously, Australian-born Moulin Rouge director Luhrmann was born neither Sebastian nor Basil, but had the name Mark Anthony on his birth certificate; his nickname arose from his supposed resemblance to a British TV fox puppet named Basil Brush.

This name was consistently in the boys' Top 200 until WW2. It's a name with so many dimensions to it: the hyper-masculine meaning, the surname-as-firstname trendiness, and the softer sound and connotation since homophone Carol was favoured in the 1940s and '50s for daughters. We think it's time for a resurgence of Carrolls amongst the boys.

Carroll

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

This ancient name, also spelled Caspar, is finally shedding its ghostly image and moving into the 21st century. Popular in the Netherlands and Scandinavia, where it's sometimes shortened to Cas, Casper could ride the style coattails of cousin Jasper.
Casper was one of the Three Magi who brought gifts to the infant Jesus along with Melchior and Balthasar.
 Some notable Caspers are one-time Secretary of Defense Casper Weinberger (called Cap) and actor Casper Van Dien, whose son is Casper Robert Van Dien III. Claudia Schiffer and Jenny Frost both used the names for their boys, while Jason Lee did a gender switch when he called his daughter Casper (sister of Pilot Inspektor).
 Casper Goodwood was the persistent suitor of the main character, Isabel Archer, in Henry James's novel A Portrait of a Lady.

Casper

A British-accented Greek name with an intellectual image that has been off the U.S. charts since 1966, but was a Top 300 name at the turn of the last century. We have the feeling Cyril's ready for a comeback.
 Cyril is the name of several saints, including the ninth century Greek missionary who invented the Cyrillic alphabet. In literature, there are Cyrils featured in the Gilbert & Sullivan operetta, Princess Ida and D. H. Lawrence's novel, The White Peacock. 
 Oscar Wilde named a son Cyril. Cyrilla and Cyrille are the appealing female forms.

Cyril

Baby girl Danas outnumber baby boys with the name nearly ten to one. But Dana is an attractive, sleek name that can certain work for babies of either gender.

Dana

Though Darcy is the ultimate Jane Austen hero name, it is rarely used for boys today though it's on the upswing for girls. A shame as it's a handsome, roguish kind of appellation that combines elements of French flair, aristocratic savoir faire, and a soft Irish brogue. And in terms of image, it's one of the quintessential <a href="https://nameberry.com/baby-names/502/english-names-for-boys">English names for boys</a>.

Darcy

Ellery is a rhythmic three-syllable boy's name that is familiar and yet rarely used--and just waiting to be discovered. It's long been identified with Ellery Queen--which was both the pen name of two cousins, Frederic Dannay and Manfred B. Lee, and the detective they created.
 Laura Dern and Ben Harper chose it for their son.

Ellery

Because the legendary Faust sold his soul to the devil, few parents would choose this for a child, although Fausto is commonly heard in Italy and Spain. 

Faust

Hercule

A name used in Germany and Holland as a form of Jerome, it's the unlikely moniker of fictional detective Hieronymous "Harry" Bosch.

Hieronymous

Kaius is a K-ization of the Latin Caius, the name of an ancient poet, introduced by style maven Rachel Zoe. More recently, it was used by Derek Jeter for his son.
 
The draw of Kaius over Caius is the easy shortening to Kai. The nickname-ability of Kaius has propelled it up the charts, where it now outranks the original Caius.

Kaius

The Hungarian classic Laszlo, with its zippy 'z' middle and energetic 'o' ending, has become something of a hipster option, beginning to be considered by cutting-edge parents.
 
A name with a royal heritage in its native country in the Ladislaus form, it is still among the top Hungarian names for boys. In Hungary, Laszlo is pronounced with a soft S sound.
 
Laszlo is probably most familiar to Americans via the noble Paul Henreid character in Casablanca, who was Czech. There have been other fictional Laszlos in Real Genius and the Doctor Who series, and Laszlo is the name of the Ralph Fiennes character in The English Patient.
 
Real life namesakes include painter Moholy-Nagy and acclaimed cinematographer Kovacs. Two well-known actors who were born with the name Laszlo are Peter Lorre and Leslie Howard.
 
The spelling of the name is sometimes streamlined to Lazlo.

Laszlo

The graceful, natural image of the verdant shade tree transcends any connection with President Johnson.
 A sturdy tree that can live for centuries, Linden was actually quite a popular boys' name from the 1930s to the 1960s--as was the presidential spelling Lyndon--but has now become unisex.

Linden

Can Linus lose its metaphorical security blanket and move from the Peanuts page onto the birth certificate? We think it has enough charm and other positive elements going for it for the answer to be yes.
 In Greek myth, Linus is both a musician and poet, the inventor of rhythm and melody who taught music to Hercules. In the Christian era, Linus was the name of the second pope, Saint Peter's successor, while in modern times chemist Linus Pauling was awarded the Nobel Prize twice.
 Humphrey Bogart as Linus Larrabee won the heart of Audrey Hepburn in Sabrina, and Matt Damon played Linus Caldwell in three of the Oceans movies. 
 Linus is currently in or around the Top 50 in Germany, Sweden and Norway, and is one of the most popular boys' names on Nameberry.

Linus

Lysander is a distinctive Greek name that could be thought of as a more creative cousin of Alexander. In ancient history, Lysander was the name of an esteemed Spartan naval commander and his literary cred comes from one of the two star-struck young men in Shakespeare's A Midsummer Night's Dream, as well as one of the twin sons (the other being Lorcan) of Luna Lovegood, whom we learn about in the Harry Potter epilogue.
 Previously confined to the nurseries of Mayfair and Belgravia, we think Lysander could easily emigrate to the playgrounds of Park Slope.

Lysander

Made famous by former child star Macaulay Culkin, one of the more popular Mac names. 

Macaulay

Saturday derives from Saturn, so with day names and mythological names both gaining wider acceptance, we may see some babies named for this relaxing day of the week.

Saturday

The girls have dibs on Spring, Summer, and Autumn, leaving this name evocative of snowy landscapes as the one possible seasonal choice for boys. And naturally, it's one of the most obvious <a href="https://nameberry.com/list/89/winter-baby-names">names for winter babies</a>.

Winter

Wirt

tippetarius's list "Uncommon Boy Names" of 25 great name ideas: Acacius - Wirt!