Boy names that start with O

243 different boy names starting with O were given to five or more US boys in 2025, 38,087 babies in all, or 2.2% of recorded boys.

The most common was Oliver, with 14,939 boys (#3 overall), followed by Owen, Oscar and Omar. The table lists the top 100 by 2025 births, with each name’s change in national rank since 2024.

Since 2024, 50 of the 100 ranked names listed here moved up the national boy ranking and 48 moved down. The biggest climb was Omid, from #8,803 to #4,497.

2 of the names listed are in the national top 100 for boys in 2025, and 16 are in the top 1,000. They run from 2 letters (Om) to 10 (Ollivander).

Only names where at least 10% of 2025 births were boys are included, so a name mostly given to the other sex is left out. Sparklines run from 1880 to 2025.