Boy Names That Start With O

Boy names that start with O in the 2025 data

O is the seventeenth most common first letter for boys born in 2025: 38,087 of them, 2.2% of every boy in the file. It has climbed from eighteenth place a decade ago, and its share has grown from 1.8% to 2.2%.

This list holds the 35 of those names that reached the top 500 as a boy's name at some point since 1880 and are still given to boys rather than girls. The most common today is Oliver, #3 with 14,939 boys in 2025. 2 of the 35 are in this year's top 100, and 31 appear in the 2025 file at all — which takes at least five births, the point below which a name is left out. Ora is left out: it reached the top 500 among boys at some point, but fewer than one in ten children given it over the last ten years was a boy. Together they account for 31,707 of those 38,087 boys — the remainder go to names that have never reached the top 500, each given to a handful of children.

The fastest climber among them is Onyx, up from #1,416 in 2015 to #365 in 2025. Omar has gone the other way, from #217 to #260. The shortest name here is Ole at 3 letters, the longest Osvaldo at 7.