Unique Baby Names Ending In O

Unique baby names ending in O (and the "o" sound) are among the very hottest right now, with the likes of Leo and Theo, Harlow and Margot rocketing up the popularity charts. But there are still oodles of obscure O-ending names out there, just waiting to be discovered. We've polled our members to bring you 100+ of Nameberry's very favorite unique O-ending baby names, from Amparo and Benno to Yarrow and Zeno. If quirky baby names ending in O are your thing, find our full list of rare, uncommon, and unique names ending in o here.

  • Agusto

  • Alamo

    Alamo is a name that would be remembered, but for all the wrong reasons. Read More 

  • Aldo

    A spirited German name very popular in Italy and occasionally used here, Aldo is one of the unique baby names with international... Read More 

  • Alecto

    Meaning "implacable; unceasing", Alecto is the name of one of the three Furies in Greek mythology: deities of the Underworld who were responsible for punishing the crimes of humanity. J. K.... Read More 

  • Amparo

    Amparo is a medieval name related to the Virgin Mary most closely associated with the city of Valencia, in Spain. Although it does not appear at all on the most recent US name roster, meaning it... Read More 

  • Angelo

    Old-school Italian name that could find new fans thanks to singer Adele, who chose it for her son after months of baby name mystery. Angelo is in the same name category as Rocco, the name of... Read More 

  • Aniko

  • Apollo

    With mythological names rising, the handsome son of Zeus and god of medicine, music, and poetry among many other things might offer an interesting, if high-pressure, option. But if Romeo and Venus... Read More 

  • Arvo

  • Aurelio

    Aurelio is an exotic and energetic Italian name rarely heard here, with an attractive aura. As the female version Aurelia gains greater notice, we expect to hear more from Aurelio too.Read More 

  • Bardo

    Bardo has a poetic beginning and upbeat ending, with roots in several diverse cultures. It may be most familiar today via George Saunders' novel Lincoln in the Bardo, which refers to the... Read More 

  • Benno

    Benno is a cool name in its own right -- there was a tenth century Saint Benno -- though it is also used as a lively nickname for Benjamin. Saint Benno of Meissen is the patron saint of anglers... Read More 

  • Benvolio

    In Shakespeare's Romeo & Juliet, the friend who persuades Romeo to go to the party where he meets Juliet. Alas.Read More 

  • Bo

  • Bosco

    Also, unfortunately, better known as a chocolate syrup. Borden and Bosco could play well together. Read More 

  • Bruno

    Bruno is a popular name throughout Europe and South America that deserves more attention here. Its color meaning makes it one of the perfect Read More 

  • Cairo

    Exotic place-name possibility with upbeat o ending. It debuted in the US Top 1000 in 2015.Read More 

  • Calico

    A word name with fashionable o-ending that has associations with both the homespun fabric and the mottled cat. Alice Cooper named his daughter Calico decades ago.Read More 

  • Callisto

    Best known as one of the moons of Jupiter, Callisto was a nymph turned into a bear by Hera after Zeus seduced her.Read More 

  • Calypso

    This hyper-rhythmic name has two evocative references. In Greek mythology, she was an island nymph, a daughter of Atlas, who delayed Odysseus from returning home. It is also a genre of West... Read More 

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