Names Ending in O for Boys

Shoso

Shotaro

Shozo

Shuo

Sicario

Sigfredo

Silberio

An easy-going name reflecting tranquillity, stillness and silence, Sileo comes from the Latin <em>sileō</em>  meaning "to be quiet" or "to rest". Despite this calming meaning, the name has plenty of energy in its sounds and flow, and could be an interesting route to nickname Leo.
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Some sources suggest the name is also a Spanish and Italian variation of the Greek Syleus, a name meaning "privateer" or "right to seize a ship". 

Sileo

Silvo

Simitrio

Simplicio

Sipriano

Sisqo

Skylar and Sky meet Shiloh, Mylo, Arlo, and Kylo in this modern creation, which made its US debut in 2025. Given to 13 boys, it could be interpreted as meaning "of the sky" (from the word), "scholar" (from Skyler and Schuyler), "sky hill" (when considered as a spin on Arlo or Harlow), or "sky soldier" (if viewed as a mash up of Milo and Sky).

Skylo

A short and cool South Slavic boy name, Slavko originated as a diminutive of longer names containing "slav" – Borislav, Radoslav, Tomislav, etc. but it is commonly used on its own. It comes from the Slavic "slava", meaning "glory". Famous bearers of this name are basketball player Slavko Vraneš, football referee Slavko Vinčić and Croatian war hero Slavko Šlander.

Slavko

Socorro

This rare masculine form of Sophia could add a fresh twist on the popular name. It is occasionally used as a feminine name in Georgia too, making this a unisex possibility. 

Sophio

Sosefo

Boy names ending in O offer many intriguing options, from such top names as Theo to unique O-ending names from Kylo to Zino.

Mateo is the most popular boy name ending with O

 right now, though there are nearly 100 O-ending boy names among the US Top 1000. Along with Mateo, other boy names in the US Top 1000 include Leo, Santiago, Diego, Romeo, and Antonio.

unique names for boys that end with the letter O

 worthy of your consideration. These range from the biblical Jethro to the ancient Greek Cosmo to the cool, modern Rio and Po.



Here are all Nameberry’s boy names that end with the letter O, ordered by their current popularity on Nameberry.

Baby boy Names ending in the letter O, with meanings, origins, and popularity, including top boy names that end in O such as Milo and Kylo along with unique O-ending names such as Quinto. (Page 137)

1770+ Boy Names Ending in O