Names Ending in O for Boys

Matthaiso is an uncommon masculine name that appears to be a variant or elaboration of Matthew (Matthaios in Greek). The name ultimately derives from the Hebrew name Mattityahu, meaning 'gift of Yahweh' or 'gift of God.' Unlike the widely used Matthew, Matthaiso remains very rare and may be a regional or cultural adaptation. The distinctive ending gives it a melodic, possibly Mediterranean or Latin American flair. While the traditional Matthew has maintained popularity across many cultures and generations, Matthaiso offers parents seeking biblical roots a unique alternative with the same meaningful foundation but a more distinctive sound and appearance.

Matthaiso

Ugenio is a masculine name that appears to be a variant of Eugenio, the Italian and Spanish form of Eugene. The name derives from the Greek name Eugenios, which means "well-born" or "noble." Without the initial 'E', Ugenio presents a unique variation while maintaining the melodic quality of its more common counterpart. The name carries connotations of dignity and aristocratic heritage, reflecting its ancient Greek origins. Though relatively rare globally, it may be found occasionally in Spanish-speaking communities or regions with Italian influence. Ugenio offers families the opportunity to honor traditional naming customs while providing a slightly distinctive alternative that still resonates with historical significance.

Ugenio

Eginio is a rare masculine name with roots in Latin and Spanish cultures. It appears to be a variation of the name Higinio, which derives from the Latin name 'Hyginius,' ultimately related to the Greek word 'hygieinos' meaning 'healthy' or 'wholesome.' This name has limited usage outside of Spanish-speaking communities. Eginio does not rank on popular name charts in most countries, making it a distinctive choice for parents seeking something unique. The name carries connotations of well-being and vitality from its etymological origins, though its rarity means it lacks widespread cultural associations or famous bearers to shape its modern perception.

Eginio

Castorio is a masculine name with Latin and Spanish origins, derived from 'castor' meaning 'beaver.' In ancient Roman culture, Castor was also known as one of the Gemini twins in mythology, associated with horsemanship and protection. The '-io' suffix gives the name a distinctly Spanish or Italian flair. While uncommon in contemporary usage, Castorio has historical presence particularly in Spain, Italy, and Latin American countries. The name carries connotations of industriousness and diligence, qualities associated with beavers. Castorio has a formal, classical sound with four melodic syllables, offering the friendly nickname options of Cas or Torio. This rare name might appeal to parents seeking something with historical depth and Mediterranean roots while remaining distinctive in modern contexts.

Castorio

Mazo is a concise masculine name with multiple potential origins. In Spanish, 'mazo' means 'mallet' or 'sledgehammer,' suggesting strength and impact. The name may also have Japanese connections, where it could derive from elements meaning 'truth' or 'sincere.' Additionally, it might represent a shortened form of longer names like Amaziah from Hebrew origins. As a given name, Mazo remains quite rare across most cultures, making it a distinctive choice. Its brevity and strong 'z' sound give it a modern, punchy quality despite potential traditional roots. The name's cross-cultural possibilities make it versatile, potentially appealing to parents seeking something concise yet meaningful. Its rarity means a child named Mazo would likely define the name's associations rather than being defined by existing name stereotypes.

Mazo

Nearly every name takes on a more sensual, worldly quality in its Italian version.

Tomasso

Eujenio is a masculine name that represents an alternative spelling of Eugenio, the Italian and Spanish form of Eugene. The name derives from the Greek 'Eugenios,' meaning 'well-born' or 'noble.' The phonetic spelling with a 'j' instead of 'g' reflects how the name is actually pronounced in Spanish, where the 'g' before 'e' has an 'h' sound. This spelling variation might be found in some Latin American communities or among Spanish-speaking families in the United States seeking to preserve pronunciation. While uncommon in official records, Eujenio carries the same distinguished history as Eugene, a name borne by several saints and popes. The name conveys connotations of nobility, dignity, and good lineage while offering a unique spelling alternative.

Eujenio

Maso

Cheno is a masculine name with multiple potential origins. It may derive from Native American languages, possibly of Pueblo origin, or could be a shortened form of names like Chenoweth (Cornish) or Cherokee. In some contexts, it might also relate to the Spanish word 'cheno' referring to goosefoot plants. The name is exceptionally rare in most English-speaking countries, giving it a distinctive quality. Cheno has a strong, compact sound with its two crisp syllables. The name carries an earthy, natural quality that might appeal to parents seeking a unique name with potential connections to indigenous heritage or natural elements.

Cheno

Arsanio is a masculine name with possible Italian or Spanish origins, though it remains uncommon in both linguistic traditions. It may be a variation of Arsenio, which derives from the Greek name Arsenios, meaning 'masculine' or 'virile.' The addition of the extra 'a' gives Arsanio a melodic quality while maintaining its strong masculine roots. The name gained limited recognition in American culture through comedian and actor Arsenio Hall in the late 1980s and early 1990s. Arsanio remains extremely rare in usage statistics, making it a distinctive choice for parents seeking an uncommon name with classical roots. Its flowing syllables and strong ending create a memorable sound while its rarity ensures uniqueness.

Arsanio

Marcellino is a masculine name of Italian origin, serving as a diminutive form of Marcello, which itself derives from the Roman name Marcellus, meaning 'young warrior' or 'dedicated to Mars' (the god of war). The suffix '-ino' adds an affectionate or endearing quality in Italian. Marcellino has melodic qualities typical of Italian names, with its flowing syllables and musical cadence. While maintaining the strength associated with its martial roots, the diminutive form adds a touch of gentleness. The name is moderately used in Italy and other Romance language regions but remains uncommon in English-speaking countries. It offers parents a distinctive Italian option with classical roots and a warm, approachable sound.

Marcellino

Ahenio is an unusual masculine name with obscure origins. It may have roots in indigenous naming traditions or could be a modern invention. The name potentially derives from elements related to 'spirit' or 'strength' in certain Native American languages, though specific etymological information is limited. Alternatively, it might be connected to the Greek word 'atheno' (strength) with modified spelling. Ahenio remains extremely rare globally, with very few documented uses as a given name. This scarcity gives it a distinctive quality that might appeal to parents seeking a truly unique name with a melodic sound. The name's three syllables create a rhythmic flow that feels both contemporary and timeless.

Ahenio

Marrio is a masculine name that represents a variant spelling of Mario, which derives from the Latin name Marius, possibly meaning "male" or "mars-like" (relating to Mars, the Roman god of war). This alternative spelling adds a distinctive touch while maintaining the strong, classic sound of the original. Though significantly less common than Mario, Marrio emerged primarily in the United States during the late 20th century as parents sought unique variations of traditional names. The doubled 'r' gives the name a slightly different rhythmic quality when pronounced. Marrio carries the same warm, friendly associations as Mario while standing out with its unique orthography, appealing to parents seeking familiar sounds with distinctive presentation.

Marrio

Gasparo is a masculine name with Italian origins, representing an older Italian variant of Casper or Gaspar. The name derives from the Persian 'ganzabara' meaning 'treasurer' and connects to the traditional story of the Three Wise Men, as Gaspar was reportedly one of the Magi who visited the infant Jesus. 

Particularly common in Renaissance Italy, Gasparo has a rich historical presence in Italian art and music, notably with the famous violin maker Gasparo da Salò. The name carries a classical, somewhat aristocratic feel with its melodious four syllables and distinctive ending. While less frequently used in modern times, it maintains appeal for parents seeking a name with historical depth and Italian cultural connections.

Gasparo

Euginio is a masculine variation of Eugene, which derives from the Greek name Eugenios, meaning 'well-born' or 'noble.' It carries a sense of distinction and refinement. The name combines 'eu' (good) with 'genos' (birth or race), suggesting someone of good stock or heritage. While less common than Eugene or Eugenio, Euginio maintains the dignified character of its root name while offering a slightly unique spelling. The name has connections to various European cultures, particularly Italian and Spanish heritage, though it remains relatively uncommon in English-speaking countries. Men named Euginio might use the nicknames Gene, Gino, or Eugi.

Euginio

Marcolino is a masculine name of Italian and Portuguese origin, serving as a diminutive form of Marco or Marcelo. The name derives from Latin 'Marcus,' which was possibly derived from Mars, the Roman god of war. With the affectionate suffix '-ino' added, Marcolino conveys the sense of 'little Marco.' This charming variation has been particularly popular in Italian and Portuguese-speaking communities, though it remains relatively uncommon in English-speaking countries. Marcolino projects warmth and friendliness while maintaining a distinct Mediterranean character. Parents might choose this name to honor a relative named Marco or Marcelo while giving their son a more distinctive variation.

Marcolino

Eujinio is a masculine name that appears to be a spelling variation of Eugenio, the Spanish and Italian form of Eugene. The name derives from Greek elements meaning 'well-born' or 'noble.' This particular spelling with a 'j' instead of 'g' might reflect regional dialectal pronunciations or personal preference for distinctive orthography. Eugenio has been used throughout history in Spanish and Italian-speaking regions, with this variant being considerably less common. The name carries connotations of nobility and good breeding from its etymological roots. While not widely used in this specific spelling, Eujinio maintains the distinguished character and cultural resonance of the more standard Eugenio, connecting its bearer to a long tradition of usage across Southern European cultures.

Eujinio

Casparo is a masculine name with Mediterranean roots, serving as an Italian and Spanish variation of Caspar or Gaspar. The original name traces back to the Three Wise Men of biblical tradition, with ancient Persian origins meaning "treasurer" or "bringer treasure." 

Casparo carries a romantic, slightly exotic quality with its flowing vowel ending, characteristic of Southern European naming patterns. While relatively uncommon even in its countries of origin, the name possesses an artistic, sophisticated air that appeals to parents seeking something distinctive yet historically grounded. The connection to the Magi gives Casparo religious significance, while its musical quality and international character make it attractive across cultural boundaries.

Casparo

Arsemio is a masculine name of uncertain origin, possibly a variant of Arsenio, which derives from the Greek name Arsenios, meaning 'virile' or 'strong.' The name has Latin and Spanish influences and carries a distinguished, somewhat scholarly tone. Arsemio is extremely rare in English-speaking countries but may be found occasionally in Hispanic communities. It offers parents seeking distinctive names an option with classical undertones yet uncommon usage. The name has a rhythmic quality with its four syllables and blends traditional roots with a unique presentation. Despite its rarity, Arsemio has a certain gravitas that suggests strength and individuality.

Arsemio

Marcano is primarily a Spanish and Italian surname that has occasionally transitioned to use as a masculine given name. Of Romance language origin, it likely derives from the Latin name Marcus, meaning 'dedicated to Mars' (the Roman god of war), combined with a locative or diminutive suffix. As a first name, Marcano offers a distinctive alternative to the more common Marco or Marcus while maintaining similar cultural roots. The name carries a strong, masculine sound with its bold ending, reflecting Hispanic and Italian heritage. Though rare as a first name globally, it may appeal to parents seeking a name with Mediterranean flair and surname style. Marcano combines traditional roots with uncommon usage, creating a distinctive identity for its bearer.

Marcano

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 57)

1770+ Boy Names Ending in O