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

Adriano

Aldo

Alessandro

Alonzo

Alto

Angelo

Antonio

Apollo

Arlo

Arrow

Arsenio

Artemio

Arturo

Aurelio

Beau

Benicio

Benno

Brio

Bruno

Caio

Cairo

Calisto

Carlo

Carmelo

Cassio

Cato

Cesario

Christo

Claudio

Cordero

Cosimo

Cosmo

Dario

Darrow

Devereaux

Diego

Domenico

Donato

Draco

Echo

Eduardo

Elio

Emiliano

Emilio

Enrico

Enzo

Ezio

Faro

Federico

Fenno

Fernando

Fiero

Francisco

Geraud

Geronimo

Giacomo

Giorgio

Hanno

Hiro

Horacio

Hugo

Ignacio

Indigo

Indio

Inigo

Isidro

Ivano

Jago

Jericho

Jethro

Julio

Junot

Kenzo

Kitto

Kylo

Laredo

Lazaro

Leandro

Leonardo

Livio

Lorenzo

Luciano

Lucio

Ludo

Ludovico

Maceo

Makeo

Malo

Manolo

Marcelo

Marco

Marino

Mario

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 (All Names)

Boy Names Ending in O - All Names