Girl Names That Start With O

Ranked in the United Kingdom in 2025, with birth trends and peak years.

O is the 14th most common first initial for baby girls in the United Kingdom, with five O names in the top 300 for 2025, led by Olivia (#1). Of those, Ophelia is the fastest-growing, now 2.3 times as common as in 2020, while Olive saw the largest increase in births, with 417 more babies receiving the name than in 2020.