Names Ending in O for Boys

Creative gem perfect for an architect's son, in tribute to modern Finnish-American architect Eero Saarinen. 

Eero

Ellio

Inigo, almost unknown in the U.S., is an intriguing choice, with its strong beat, creative and evocative sound, and associations with the great early British architect and stage designer Inigo Jones. The sixteenth-seventeenth century Jones shared his name with his father, a London clockmaker, who received it when <a href="https://nameberry.com/baby-names/806/spanish-names-for-boys">Spanish names for boys</a> were fashionable in England, especially among devout Roman Catholics.
 Inigo Montoya is a character in The Princess Bride, played by Mandy Patinkin.
 Inigo is one name that's both classic and rare, given to only 14 baby boys in the US last year. The pronunciation is with short i's and a hard g: IN-ih-go.

Inigo

Joaopedro is a masculine name that combines two traditional Portuguese names: João (John) and Pedro (Peter). In Portuguese-speaking countries, particularly Brazil, it's common to combine two given names, sometimes written as João Pedro or as a single name Joaopedro. João derives from the Hebrew name Yochanan, meaning "God is gracious," while Pedro comes from the Greek Petros, meaning "rock" or "stone." This combination name carries significant religious heritage, as both John and Peter were important apostles in Christian tradition. Joaopedro is especially popular in Brazil, where compound names are a cultural tradition. The name projects strength and religious significance while maintaining a melodic quality typical of Portuguese naming patterns. Despite being two names combined, Joaopedro is often treated as a single identity in Portuguese-speaking cultures.

Joaopedro

Kaelo

Kiko is a versatile masculine name with multicultural origins. In Japanese, it can mean 'happy child' or 'rare child,' while in Hawaiian culture, it's often a diminutive of Francisco or Federico. The name also appears in African languages, particularly Swahili. Kiko's brevity and repeating 'k' sound create a rhythmic, memorable quality that works well across different languages and cultures. This short, punchy name has gained moderate popularity globally, particularly in Spanish-speaking countries and Japan. Parents are drawn to Kiko for its international appeal, positive connotations, and contemporary feel. The name's cross-cultural presence makes it suitable for families with mixed heritage or those seeking a modern name that travels well across borders.

Kiko

Lalo is a warm, friendly masculine name with multiple cultural origins. In Spanish-speaking communities, it often serves as a diminutive for Eduardo (Edward) or Gonzalo. The name also appears in Native American cultures, particularly Hopi, where it can mean 'water coming down.' In Hawaiian contexts, Lalo can mean 'below' or 'down.' The name's brevity and repeating 'l' sound give it a melodic, approachable quality that travels well across languages. While not ranking among the most common names in the United States or Europe, Lalo has maintained steady popularity in Latin American countries and Hispanic communities. Its cross-cultural versatility and friendly sound contribute to its enduring appeal.

Lalo

Lucario

Marcielo

Nyko

Also written as Otávio, this streamlined form of the Ancient Roman Octavius is notably borne by the Brazilian football players Otávio da Silva Monteiro and Otávio Ataide, both known more commonly as just Otávio. In recent years it has begun to see very subtle shifts up the US charts, with 10 boys receiving the name in 2024.

Otavio

Primo is number one among the Latin birth-order names--Octavius et al--and the one most likely to be used in these days of smaller families. It has that jaunty 'o' ending and Italian flavor that many modern parents like so much. And what little boy wouldn't appreciate being prime?
 Italian author Primo Levi, known for his writings on the Holocaust, is a famous bearer.

Primo

Ramelo

This name of a famous ancient Roman jurist is sometimes heard in the Hispanic community. 

Sabino

Attractive Italian form of Xavier, originally a Basque place name most notably borne by St Francis Xavier, a Jesuit priest and missionary. 

Saverio

Silo is an uncommon masculine name with multiple potential origins. It may derive from Latin roots, possibly related to the word for a grain storage structure, or it could come from Germanic elements. The name also appears in ancient history as that of a king of Asturias in Spain during the 8th century. Silo has a distinctive, minimalist quality with its brief two syllables and open ending. The name's rarity makes it an intriguing choice for parents seeking something genuinely unique with historical echoes. Despite its brevity, Silo carries a certain strength and clarity. Its uncommon nature means most bearers of this name would likely be the only one in their community.

Silo

Thyago

Tylo

Valencio is an energetic, valiant-sounding name, the male form of Valencia.

Valencio

Xolo has a totally cool, super contemporary feel about it, with its unique X initial and its charming -o ending. Reminiscent of Milo, Arlo, Kylo, and Solo, it also has the vibe of Xander or Xavier. 
 
While it may feel like a modern invention, Xolo has its origins in Aztec mythology. Likely derived from Xolotl, it is connected to the Aztec god of fire, lightening, and death, who appeared in the form of a dog. As such, Xolo is also used as a nickname for the hairless dog breed, Xoloitzcuintle.
 
Alternatively, Xolo may also have its roots in Southern Africa, where it can mean "peace" and "calm" in Xhosa.
 
Actor Xolo Maridueña is a notable bearer, whose fame may have helped place this name in the US stats for the first time in 2024 when it was given to six boys.

Xolo

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 26)

1770+ Boy Names Ending in O