1770+ Boy Names Ending in O

A cutesy nickname — identical sounding to the more substantial Rue and Roux.

Italian variation of Aurelius.

Elegant and worldly.

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.

With cool, on-trend sounds and a hint of Star Wars about it, Rylo is an up-and-coming name that has only seen notable use since 2016. It can be considered a Scottish diminutive of Ryland and an Irish surname, but also a compound name made up of Ryan and Milo. Given to nearly 130 babies in 2023, it has been rising in use every year since the mid 2010s.

Fiorello is one of the few floral names that works well for a boy. The colorful three-term World War II New York Mayor La Guardia made this one famous -- in fact he was nicknamed "the Little Flower". His life was the basis for the 1959 musical called, appropriately, "Fiorello!"

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

A saint and surname often heard in Italy.

Singer Perry is long gone, but the beautiful northern Italian lake conjures up a clear and tranquil image.

Ilario's merry, jovial sound reflects a shared root with the word hilarious.

What with Paul Simon's classic lyric about Julio down by the schoolyard and several distinguished bearers, this livelier Spanish version of Julius is completely familiar to the non-Hispanic community and would make a great choice for a bicultural family. Popular in Brazil, it also ranks in the US Top 600 and given to more than 500 boys each year. NFL Atlanta Falcons star Julio Jones bears this name.

Boo as a first name first achieved notoriety as the name of the child-man in Harper Lee's To Kill A Mockingbird. Arthur "Boo" Radley was meant to be frightening, but only in a simple, non-threatening way. More recently, Boo has been used as the middle name of one of chef Jamie Oliver's children and the nickname in the middle of television's Honey Boo Boo. Boo is also the name of the world's cutest dog and of the adorable little girl in Monsters Inc. In a more basic way, Boo is a term of endearment.

Religious name long common in Italy, as is the diminutive Santino. In the Cornwall region of England, it's a traditional diminutive for Alexander.

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 Tibetan Buddhist state of suspension between one life and the next, resembling the Christian idea of Limbo. Bardo is also an ancient saint's name: Saint Bardo was the eleventh century bishop of Mainz, in Germany. Actress Sandra Bullock chose Bardo as her son's middle.

Kazuo is a boys' name well-used in Japan though not well-known in the U.S. Kazuo Ishiguro is the author of Remains of the Day and Never Let Me Go. The emphasis is on the first syllable.

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

Whether Neco is a spelling variation of the ever-more-popular Nico, pronounced NEE-koh, or an invented name all its own, it is a highly uncommon choice, given to just 5 baby boys in the US in 2021.

Cool Finnish name ripe for import.

Shortening Francisco somehow makes it sound even cooler. Cisco is also the name of a digital security company.