Boy names ending in the letter O have been fashionable for a couple of decades now, with many of the most popular choices zooming to the top of the list.

The best boy names ending in O include selections from those top names as well as unique O-ending names. The Top O-ending boy name in the US right now is the Spanish Mateo. Along with Mateo, other boy names ending in O in the US Top 500 include Leo, Santiago, Milo, and Theo.
Unique boy names ending in O that make our best list include Anselmo, Benno, Caio, and Laszlo.
Of course, O is the usual ending for boys' names in Italy, Spain, and other Latinate countries. O-ending boys' names popular internationally include choices from those lands as well as boys' names with other origins that carry the O ending.
We've included a few fashionable names here that don't technically end in O but in the O sound.
If you want to explore beyond our Best List, see our master list of nearly 1800 <a href="https://nameberry.com/baby-names/901/boy-names-ending-in-o">boy names ending in o</a>.

Boy Names Ending in O

Malo, the name of an important sixth century Breton saint who founded St. Malo, the charming port town in Brittany -- is considered quite au courant in France right now, ranking firmly in the Top 100. 
 Saint Malo of Aleth, a patron saint of lost items, was consecrated the first Bishop of Aleth. He was also known as Maclou, Maclovius and, in Italian, Macuto.
Malo is worth thinking about as a highly unusual alternative to Milo, although, word of warning: malo means "evil" or "bad" in Spanish, which, depending on where you are in the world, could be something to keep in mind before you choose it.

Malo

Morocco is an attractive and rhythmic name, evocative of such fabled cities as Casablanca, Tangier and Marrakesh, in a country whose unique landscape and rich culture attracted such twentieth century writers as Tennessee Williams, Paul Bowles and William Burroughs.
 Mike Tyson named his baby boy Morocco Elijah. Mariah Carey's son is Moroccan. From all African place names, this is one of the most appealing.

Morocco

Navarro

Nicolo is a more lively variation of Nicholas and one of the most attractive <a href="https://nameberry.com/baby-names/506/italian-names-for-boys">Italian names for boys</a>. A name with a long, distinguished Italian history of its own, it also boasts the charming nickname Nico.
 Although the female counterpart, Nicola, has long been a favorite in the UK, Nicolo has not yet made a similar transition. It was chosen, though, by actor Stanley Tucci, for his son.
 Nicolo is a name with musical reverberations, connected to the major early violin maker Amati, and the later violin virtuoso Paganini.

Nicolo

The most popular of the number names used by Hispanic parents, open to all. Octavia and Octavio are two <a href="https://nameberry.com/baby-names/161/spanish-names">Spanish baby names</a> that are moving out into the wider world.

Octavio

Best Boy Names Ending in O

Best boy names ending in the letter O, including Arlo, Thiago, Milo, and Theo with origins, meanings, and popularity (Page 10)