Names Ending in O for Boys

A bold, brave choice, that some may worry is a little heavy to bestow on a child, Hero wouldn't seem too out of place alongside Chosen, Merritt, or Noble. Though the mythological Hero was female, as a word name, it could easily be a unisex option.
 
In fact, it leans masculine in the US, where a recent year saw it given to 65 boys compared to 5 girls.

Hero

This semi-obscure historic name was recently chosen for their son by Halle Berry and Olivier Martinez.
 A possible namesake is Maceo Grajales, a Cuban guerrilla leader who was second-in-command of the Army of Independence. Another is Harlem Renaissance figure Maceo Pinkard, composer of the song "Sweet Georgia Brown."

Maceo

Genaro is a masculine name with Italian and Spanish origins, derived from the Latin 'Januarius,' meaning 'of January' or 'dedicated to Janus,' the Roman god of doorways, transitions, and new beginnings. The name is particularly associated with Saint Januarius (San Gennaro), the patron saint of Naples, Italy, celebrated for the miracle of the liquefaction of his blood. Genaro remains popular in Italy, Spain, and throughout Latin American countries, especially among families with Italian or Hispanic heritage. The name carries connotations of protection and renewal, with its connection to both the saint and to January, the month of new beginnings. With its rhythmic three syllables and strong cultural connections, Genaro offers a distinctive yet accessible option with deep historical roots.

Genaro

Mattheo is another way to say Matteo, one that gets you to either Matt or Theo

Mattheo

Eliano is a melodic masculine name with Italian and Spanish origins, derived from the ancient Greek name Helios, which means 'sun.' In some cases, it may also connect to the Hebrew name Elijah ('Yahweh is God'). With its flowing four-syllable structure and harmonious vowel sounds, Eliano carries a romantic, Mediterranean quality that evokes warmth and brightness. While more common in Italy, Spain, and Latin American countries, the name has gained modest international appeal as global naming trends embrace more diverse cultural options. Eliano offers families a distinctive yet accessible choice that works well across languages while maintaining its connection to classical roots and celestial imagery.

Eliano

Melo is a concise masculine name with multiple cultural origins. In Greek, it relates to 'melos' meaning 'song' or 'melody,' giving it musical connotations. In some Portuguese and Spanish-speaking regions, it functions as a shortened form of surnames like Carmelo or as a nickname for Carmelo, which refers to Mount Carmel in Israel. The name has a modern, vibrant quality while maintaining simplicity. With just four letters, Melo is easily pronounced across various languages and cultures. Though uncommon as a formal given name, its rising usage reflects contemporary preferences for short, distinctive names. It carries a friendly, approachable quality while still feeling distinctive and memorable.

Melo

Adriano is a dashing Italian name which gets around the possible gender confusion of Adrian.

Adriano

More dramatic, worldly, and energetic spin on Gregory. 

Gregorio

The final o in Patricio adds a bit of punch and pizzazz, though it also spins the name closer to the feminine Patricia. 

Patricio

Cool spin on Miklos, a Hungarian form of Michael.

Miklo

Lino has two separate origins. It can be a diminutive of Italian names like Angelino, Marcelino, and so on — and it is also the Spanish, Italian, and Portuguese form of Linus.
 
With its bright and breezy sound, and easy pronunciation, it's an ideal name to fit into many cultures and languages. We suspect it would be more popular were it not spelled the same as lino (as in linoleum flooring).

Lino

Amelio is a masculine name with Latin and Italian roots, derived from the Latin word "amelius" meaning "industrious" or "striving." It can be seen as a masculine form of Amelia or as a variation of the Italian name Aurelio. The name carries connotations of diligence, improvement, and noble qualities. While not widely used in English-speaking countries, Amelio has maintained some popularity in Italian and Spanish-speaking regions. The name has a melodic, romantic quality with its flowing vowels and soft consonants. As a less common alternative to more familiar names like Emilio or Antonio, Amelio offers distinction while still having recognizable Mediterranean charm.

Amelio

Romantic and artistic Domenico is ripe for the picking as a relatively rare name that fits in with current favorites such as Leonardo and Emiliano.
 
Domenico is the name of many great creatives throughout history, including many painters, composers, and sculptors. In modern times, Domenico has been associated with designer Domenico Dolce, cofounder of fashion house Dolce & Gabbana.

Domenico

More common as a dog name than a baby name for now, but that hasn't stopped Milo and Rex rising back up the charts! Lovers of edgy o-ending names like Otto, Arlo and Cosmo might like this starry-eyed possibility.

Astro

Mikko

With deep historical roots dating back to medieval Europe, Raymundo spread throughout Spain and Portugal before traveling to Latin America, where it maintains consistent popularity. The name conveys strength and wisdom, often associated with dependability and thoughtful leadership. 

While less common in English-speaking countries, Raymundo remains a traditional choice in Hispanic communities worldwide. Its full form offers the friendly nicknames Ray, Mundo, or Mondi, adding versatility to this classic name with its distinctive Spanish flair.
Ramon is another Spanish and Portuguese variation of Raymond.

Raymundo

Juno is a boy's name of Latin origin. Traditionally known as the Roman goddess of marriage and childbirth, Juno has crossed gender boundaries to become a distinctive masculine choice. The name carries associations with protection, vitality, and leadership. While relatively uncommon for boys, it has a strong, concise sound with its two syllables ending in a resonant 'o' that feels both classical and contemporary. Juno has gained some visibility through cultural references, including the popular film 'Juno,' though that featured a female protagonist. As parents seek unique names with historical roots, Juno offers boys a name with gravitas and a touch of mythology.

Juno

Sylo

Romello is a masculine name with multiple potential origins, possibly representing a diminutive form of Romeo (Italian, meaning 'pilgrim to Rome') or a variation of Romulo (Spanish form of Romulus, the mythical founder of Rome). The name blends classical Roman references with a melodic, contemporary sound. Romello emerged in American naming practices during the late 20th century, gaining modest usage particularly in the 1990s and 2000s. The name carries a romantic, musical quality with its flowing syllables and soft ending. Its Latin roots give it historical depth while its modern sound appeals to contemporary tastes. Romello offers parents a distinctive yet accessible choice that balances uniqueness with familiar phonetic elements.

Romello

Zeno, the name of two ancient philosophers, has a muscular dynamism that's lightened by its cheerful final vowel, resulting in a kind of offbeat sci-fi feel. Zeno of Citium was the founder of the Stoic school of thought, Zeno of Elea was another early, original Greek thinker, famed for his Paradoxes.
 Zeno Cosini is the protagonist of the Italo Svevo novel Confessions of Zeno.

Zeno

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 9)

1770+ Boy Names Ending in O