Names Ending in O for Boys

Wilho

Wilibaldo

Wiljo

Willibaldo

Stylish and easy going Winslow is a surname-style choice and a place name that up until 2009 was predominantly, albeit quietly, used on boys. Now, it is a unisex option that currently leans feminine. This spelling variation has yet to enter the charts but with Marlo and Munro catching on, this stripped back choice might appeal in the future. 
 
Derived from Old English, the name literally means "Wine's hill" or "hill belonging to Wine", but given that Wine is a given name meaning "friend", a more figurative interpretation is "friend's hill".

Winslo

Woodro

Xalo may be a Spanish place name, located in Valencia and also known as Jalón. As such, it may mean "extravagance" or "pleasure", or "milestone, land marker". Alternatively, it could be inspired by the Bulgarian Zalo, meaning "healthy", though it's just as likely it's a modern creation, based on Xander, Xavier, Arlo, and Milo. 
 
It debuted in the US stats in 2024 when it was given to five boys.

Xalo

Xandro

A new entry into the US data for 2025, Xero, with its cool X- initial, was chosen for 5 boys in a recent count. It may be considered a respelling of Zero, to get that edgy sound without associating it too heavily with emptiness and nothingness. 
 
Alternatively, it could be a spin on the Greek and Persian Xerxes ("ruler over heroes") or a variation of several Galician names, including Xeraldo ("power of the spear"), Xerome ("sacred name"), or Xairo ("he shines").

Xero

Xiao

Yahyo

Yancarlo

Yankarlo

Yanko

Yaro

Yasuhiro

Yeraldo

Yero

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 144)

1770+ Boy Names Ending in O