1770+ Boy Names Ending in O

Elegant and worldly.

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

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.

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.

Cool Finnish name ripe for import.

A unisex Chinese and Vietnamese with an appealingly simple, vowel-rich spelling.

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!"

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.

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

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.

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

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.

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

Ugo is very common in Italy, but here it might call to mind that little Yugoslavian car.

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

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

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

Silvanus was the Roman god of the forests and is also an alternate name in the New Testament for Silas. Relatives include Silvio, Silvius, and Sylvia.

In the Shona language of souther Africa, this simple and wearable boys' name means love.

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.