<a href="https://nameberry.com/list/317/Unique-Baby-Names">Unique baby names</a> ending in O (and the "o" sound) are among the very hottest right now, with the likes of Leo and Theo, Harlow and Margot rocketing up the popularity charts. 

But there are still oodles of obscure O-ending names out there, just waiting to be discovered. We've polled our members to bring you 100+ of Nameberry's very favorite unique O-ending baby names, from Amparo and Benno to Yarrow and Zeno. 

If you want to see even more baby names ending in O, check out our complete lists of <a href="/baby-names/875/girl-names-ending-in-o">Girl Names Ending in O</a> and <a href="https://nameberry.com/baby-names/901/boy-names-ending-in-o">Boy Names Ending in O</a>.

If quirky baby names ending in O are your thing, find our full list of rare, uncommon, and unique names ending in o here.

Unique Baby Names Ending In O

Alamo

Aldo

Alecto

Amparo

Angelo

Aniko

Anno

Apollo

Artemio

Arvo

Augusto

Aurelio

Bardo

Benno

Benvolio

Bosco

Bruno

Cairo

Calico

Callisto

Calypso

Caro

Cato

Celestino

Cicero

Cleo

Coco

Consuelo

Cosmo

Dario

Dido

Draco

Dynamo

Echo

Eero

Elio

Eliseo

Ezio

Fabio

Faro

Fidelio

Fiero

Franco

Galileo

Garbo

Gennaro

Hallow

Halo

Hanno

Harlow

Haruko

Hero

Horatio

Ianto

Indigo

Inigo

Isabeau

Isidro

Ivalo

Jago

Jericho

Juno

Kahlo

Keiko

Kitto

Laszlo

Leto

Lilo

Lucero

Ludo

Margalo

Marlowe

Maximo

Meadow

Milagro

Miro

Mungo

Natalino

Navarro

Nemo

Orlando

Orlo

Oslo

Othello

Otto

Pacifico

Pascoe

Peridot

Philo

Pippo

Quito

Rocco

Rocio

Rollo

Unique Baby Names Ending in O

Unique baby names that end in the letter O, with meanings, origins, and popularity, including top O-ending boy names such as Leo and Theo as well as unique, uncommon boy names that end with the letter O. (All Names)

Unique Baby Names That End in O - All Names