Girl names that start with O

180 different girl names starting with O were given to five or more US girls in 2025, 27,135 babies in all, or 1.7% of recorded girls.

The most common was Olivia, with 13,544 girls (#1 overall), followed by Oaklynn, Oakley and Olive. The table lists the top 100 by 2025 births, with each name’s change in national rank since 2024.

Since 2024, 54 of the 100 ranked names listed here moved up the national girl ranking and 40 moved down, while 5 had no national rank the year before. The biggest climb was Oluwatamilore, from #17,063 to #9,310.

1 of the names listed is in the national top 100 for girls in 2025, and 12 are in the top 1,000. They run from 3 letters (Ola) to 13 (Oluwatamilore).

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