Names Ending in O for Boys

An anglicized spelling of the Spanish and Portuguese form of Jerome. 

Jeronimo

A contemporary, on-trend sounding choice, Zylo feels like a mash up of Milo and Zion, with a hint of Zander and Sylas thrown in. Given to 51 boys in the US in a recent year, Zylo is likely an alternative spelling of Xylo, derived from the Greek xylon, meaning "wood" or "the Cross" (in the Biblical sense).
 
Alternatively, its use in Albania may be owing to the satiric novel, The Rise and Fall of Comrade Zylo by Dritëro Agolli, published in the 1970s. While the exact etymology is unknown, it well may be inspired by the Greek root listed above, or by the Turkic zül meaning "humbled, low, humiliation.". Either way, it would likely be pronounced zoo

Zylo

With a touch of celestial power, a hint of clunky charm, and the totally cool -o ending, Cosmo may well be finally shaking itself free of both the Seinfeld association (which made it a punchline of a joke) and the cartoon fairy association from The Fairly OddParents. In fact, it is in the Top 1000 in the UK and a favorite on Nameberry. 
 
An Italian variant of Cosimo or Cosmas, the name Cosmo has its roots in Greek, where it means "order, universe, beauty." It was first introduced to Britain when an 18th century Scottish Duke used it for his son, in honor of his friend, Cosimo III de' Medici. 
 
Long neglected as it has been in the US, some parents are coming round to the idea of Cosmo again, with nearly 100 boys receiving the name in a recent year. Influential celebrity couple Scarlett Johansson and Colin Jost chose it for their son, born in 2021, while YouTubers Life with Beans used it in 2020, which may well help to change how people view Cosmo. 
 In literature, Baron Cosmo Bradwardine is a character in Sir Walter Scott's novel Waverley and Cosmo Topper is the befuddled banker in Thorne Smith's humorous novel Topper. In modern times Cosmo has become the short form for Cosmopolitan – both the magazine and the cocktail. And for those wishing to honor a medic in the family, Cosmo is also the name of the Arabian-born patron saint of doctors.
 
With its cosmic meaning and creative feel, Cosmo may also appeal to those looking for alternatives to Atlas, or for those who like Evren.

Cosmo

Two beloved, fashionable names combined to make one: Kai, a simple and serene Hawaiian name meaning "ocean" and Kylo, created for Star Wars character Kylo Ren, played by Adam Driver. With Kailo, you get the best of both worlds.

Kailo

Giorgio as is rich in meaning and history as George, but with more Italian flair. It's a consistent Top 50 hit in Italy, and with Italian boy names like Gianni and Lorenzo rising through the charts, could be another one to add to the mix.
The best-known modern bearer is fashion designer Giorgio Armani.

Giorgio

Oslo, the capital city of Norway, makes for an intriguing new place name, especially with its bookended O's, as in Otto and leads to cool nickname Ozzie. One Berry has already used it and we predict others will follow; in fact, stats suggest it is used eight times more often than it was a decade ago.

Oslo

Jacobo

Ronaldo gained international prominence largely through Brazilian football (soccer) superstars, most notably Ronaldo Luís Nazário de Lima and later Cristiano Ronaldo. These sporting icons helped propel the name to global recognition, particularly in countries with strong football cultures. 

Ronaldo carries a dynamic, energetic quality and conveys strength and athletic prowess. While particularly popular in Portuguese and Spanish-speaking countries, the name has gained international appeal. The association with sporting excellence has made Ronaldo an attractive choice for parents seeking a name with connotations of success, skill, and determination.

Ronaldo

Paolo is an irresistibly lush <a href="https://nameberry.com/baby-names/506/italian-names-for-boys">Italian name for boys</a>, worlds more romantic than its spare English equivalent.
 Among noted bearers of the name are Renaissance painters Uccello and Veronese, architect Soleri, and whole teams of Italian soccer players &mdash; or so it seems.
 Another possibility is the Spanish version of Paul: Pablo, as in Picasso and Casals.

Paolo

Commonly heard in Hispanic cultures, a rhythmic possibility here. 

Domingo

Rigoberto is a masculine name of Germanic origin, combining the elements 'rik' meaning 'power', 'ruler', or 'wealthy' and 'beraht' meaning 'bright' or 'famous'. It literally translates to 'bright ruler' or 'famous power'. The name is particularly popular in Spanish-speaking countries, especially in Latin America, where it has been embraced since medieval times. Rigoberto has cultural significance in various communities, with notable bearers including athletes, political figures, and artists. The name offers the friendly nickname options of 'Rigo' or 'Berto'. While maintaining steady usage in Hispanic communities, Rigoberto represents a strong, traditional choice that carries both authority and warmth, embodying aspirational qualities many parents wish for their sons.

Rigoberto

If Frederick feels too heavy, the Spanish and Italian has more energy. It's a long-term Top 20 name in Italy, and has neat nicknames like Fredo in Italian and Fede in Spanish. Famous bearers include the Spanish poet Federico García Lorca and the Italian filmmaker Federico Fellini. Further back in history, it was the name of a fifth-century Visigoth leader, the brother of Theodoric II.

Federico

Everardo is a masculine name of Germanic origin, representing the Spanish and Italian form of Everard or Eberhard. The name combines the elements 'eber' meaning 'wild boar' (a symbol of strength and courage in Germanic cultures) and 'hard' meaning 'brave' or 'strong.' Particularly popular in Latin American countries, especially Mexico, Everardo carries a dignified, classical quality while functioning well in Spanish-language communities. The name has maintained consistent usage without becoming overly common, giving it both familiarity and distinction. Everardo offers the nickname options of Ever or Ardo, adding versatility. The strong vowel endings create a melodic flow characteristic of Spanish names, while the historical roots provide substance and meaning that has helped the name endure through generations.

Everardo

Marko is one of the many names derived from Mars, the god of war. Marco is the more usual Spanish form but Marko is a variation used in Spain along with Russia, Ukraine, and several Slavic countries.

Marko

A popular Japanese name with an uplifting meaning, Kaito is connected to the air and the sea. Said with three syllables and not the two English speakers may expect, it has been borne by a number of Japanese footballers, along with several popular fictional characters, including Kaito Momota of Danganrompa, and the Vocaloid Kaito.

Kaito

Santhiago is a masculine name representing a distinctive variation of Santiago, which itself derives from the Hebrew name Ya'akov (Jacob) and means 'supplanter.' The name gained prominence through Saint James (Santiago in Spanish), one of Jesus's apostles who became the patron saint of Spain. The unique spelling with 'th' instead of 't' adds a contemporary twist while maintaining the name's cultural roots. Santhiago carries strong Hispanic and Portuguese influences while offering a slightly more uncommon alternative to the traditional spelling. The name evokes images of strength, faith, and cultural heritage, making it increasingly popular among parents seeking names with both cultural significance and modern appeal.

Santhiago

Aero is a distinctive masculine name with modern appeal, derived from the Greek word 'aer' meaning 'air' or 'atmosphere.' This contemporary name evokes associations with flight, freedom, and the expansiveness of the sky. While relatively uncommon as a given name, Aero has gained modest recognition through its use in aviation terminology and as a brand name for various products related to movement and technology. The name's brevity and strong vowel sounds create a memorable quality that appeals to parents seeking something unconventional yet accessible. Aero's simplicity makes it easily pronounced across different languages, giving it international versatility. As a name choice, it projects an image of dynamism and modernity, appealing to those drawn to nature-inspired names with a technological edge.

Aero

Braulio is a masculine name with deep Spanish and Portuguese roots, derived from the Germanic name Braulius, combining elements meaning 'bright' and 'famous.' The name carries historical significance through Saint Braulio, a 7th-century bishop of Zaragoza, Spain, known for his scholarship and wisdom. Braulio has maintained consistent popularity in Spanish-speaking countries, particularly Mexico and throughout Latin America. The name has a strong, distinctive sound with its flowing three syllables. While less common in English-speaking regions, Braulio is gaining recognition amid growing appreciation for Hispanic cultural heritage. The name conveys intelligence, strength, and dignity, offering parents a choice that's both culturally rich and melodic.

Braulio

A refreshing variation on the Biblical classic Matthew, this Hawaiian form blends the stylish -o ending with the cool Kai sound. First appearing in the US stats in 1999, it has been climbing steadily upwards ever since. 
 
The name of a popular ukulele brand, a famous orca, and two popular horses on Instagram, Makaio was given to nearly 90 boys in 2023 and with Makai already in the Top 1000, Makaio might continue to rise.

Makaio

An attractive surname, but also the name of a popular cookie.

Milano

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 8)

1770+ Boy Names Ending in O