Baby Names Starting With O
O is the 18th most common starting letter for baby names in the US — 2.2% of babies given a top-1,000 name have one. Olivia and Oliver lead the way.
How popular is the letter O?
Measured across every name in the 2025 SSA top 1,000 lists.
O names rising fastest
Already in the top 1,000 and still climbing — the O names gaining ground.
Where O names come from
Origins of the O names in the top 1,000. English leads with 10.
All baby names starting with O
433 names found
Oak
The oak tree; strength and endurance
Oaken
Of the oak tree
Oakes
Near the oak trees
Oaklan
Oak meadow or land of oaks
Oakland
Land of the oaks
Oaklea
Oak meadow
Oaklee
Oak meadow or clearing
Oaklei
Meadow of oak trees
Oakleigh
From the oak tree meadow
Oaklen
Oak meadow or oak grove
Oakley
Meadow of oak trees
Oakli
Meadow of oak trees
Oaklie
Meadow of oak trees
Oaklin
Little oak or from the oak pool
Oakly
Meadow of oak trees
Oaklyn
Oak meadow or beautiful oak
Oaklynd
Oak forest or meadow
Oaklynn
Oak meadow or lake near the oaks
Oaklynne
Oak tree and lake
Oaks
Near the oak trees
Baby names starting with O: common questions
What is the most popular baby name starting with O?
Olivia is the most popular girls' name starting with O (#1 in the US), and Oliver is the most popular boys' name (#3), based on 2025 Social Security Administration data.
How common are baby names starting with O?
O is the 18th most common starting letter for baby names in the US. 56,601 babies — 2.2% of those given a top-1,000 name in 2025 — received a name beginning with O, across 26 different names.
Which O names are getting more popular?
Oaklynn, Oakley, Ophelia, Otto, Opal are all in the top 1,000 and climbing in national popularity.
Where do O baby names come from?
Among O names in the top 1,000, the most common origins are English (10 names), Greek (6 names), Germanic (5 names).