1770+ Boy Names Ending in O

An anglicized spelling of the Spanish and Portuguese form of Jerome.

The double-A is often a hard sell for baby names in an English-speaking context, and many will find Dario, as in public intellectual Dario Fo, appealing enough with just one. But diehard Game of Thrones fans may be attracted to this version, as it is the first name of charming rascal Daario Naharis, a mercenary first hired, then seduced, by Daenerys Targaryen during her conquest of Slaver's Bay.

Charming way to freshen up Jacob.

Carmelo is the more popular spelling of this name in the US, probably thanks to basketball great Carmelo Anthony. Carmelo ranks in the Top 1000 and was given to about 350 baby boys last year, while Carmelo and the original Carmen were each used for about 50 baby boys.

Deceptively close to Bernardo, but suaver.

Nacio is attractive and energetic -- one of the most appealing Spanish nickname names. Songwriter Nacio (born Ignacio) Herb Brown wrote many American standards, including Singin' in the Rain.

A variant of Estonian Riivo, of uncertain meaning, that fits right in with cool water names like River and Rio.

The name of one of the greatest Western philosophers is often used as a first name in its land of origin, Greece, and would make a really interesting, thought-provoking choice here. It is remembered here as the nickname of the memorable character played by Sal Mineo in the classic film "Rebel Without a Cause."