1770+ Boy Names Ending in O

As with Guillaume (see above), Liam, Willem, and Wilhelm, everyday Williams in their own countries, Guillermo is a captivating possibility here. Giermo, Gigermo, Gijermo, Gillermo, Gillirmo, Giyermo, Guermillo, Guiermo Guilermón, Guille, Guillelmo, Guillermino, Guillo, Guirmo, Gullermo, Llermo, Memo, Quillermo.

Subtract the last two letters of Arnold, and you're left with a much more modern-sounding name. Arno is also the name of the main river in Florence, upon which sits the famed Ponte Vecchio. The Italian river name means "flowing water".

Ichiro is a good classic choice for the first boy in a Japanese family.

Musical term with a lot of energy.

Also written as Eijirō or Eijirou, this name was traditionally borne by second-born sons.

Tao is the Chinese word for the underlying harmony of the universe, combining both yin and yang. Extreme kayaker Tao Berman made this one of the spiritual names prime for adoption. Tao rhymes with cow.

Softer than Benedict, less popular than Benjamin, and bolder than Bennett, Puerto Rican actor Benicio Del Toro introduced this name to the American mainstream in the early 2000s, before which the name was hardly use. Popular in Argentina, Benicio debuted on the US Top 1000 in 2016, when it was the third-fastest-rising boys' name, and while it hasn't skyrocketed then, it remains comfortably in the charts.

Armando takes the flat-footed Herman and makes it romantic. This is another of the Latin names we expect to be seeing more of.

The increasing popularity of Camila may have pushed this underrated Spanish name into the Top 1000 — though it remains far less popular than its feminine counterpart. A perfect familiar-but-rare choice.

Rhythmic Welsh nickname name, derived from the Welsh royal name Iorwerth, which has sometimes been anglicized as Edward.

A welcoming name that seems to say "hello". Celio can be thought of as a much rarer male variation of Celia. With heavenly names in the ascendant, we may be hearing lots more of Celio.

Claudio, a most appealing Italian name, is featured in not one, but two Shakespearean plays, ,Measure for Measure and Much Ado About Nothing. While "lame" is the most widely acknowledged meaning, some etymologists theorize that the name may relate to the word for enclosure or clause, an alternate meaning that may appeal to a child with a form of this otherwise-attractive name.

Best known as the name of Naruto Uzumaki, the main character in the Naruto anime series. It's also a common place name in Japan—the Naruto whirlpools are said to have inspired the name of the manga character.

Stalwart Italian classic, completely at home in this country.

About 100 baby boys were named Lucio in the US last year, a number we expect to increase with the growing popularity of all names in the Lu family. It's a family united by sound, with three main branches.

This euphonious Italian Italian name for boys, often associated with the painter Modigliani, makes a recommended creative choice. The Spanish tend to spell it Amadeo.

If Frederick feels too heavy, the Spanish and Italian has more energy. It's a long-term Top 20 name in Italy, and has neat nicknames like Fredo in Italian and Fede in Spanish. Famous bearers include the Spanish poet Federico García Lorca and the Italian filmmaker Federico Fellini. Further back in history, it was the name of a fifth-century Visigoth leader, the brother of Theodoric II.

Zero has been documented as a given name before, but it's largely familiar as a stage name (such as Zero Mostel, born Samuel Joel Mostel) and comic book and anime characters.