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Baby Names Starting With O

1,410 names begin with O. The most popular in 2025 are Oliver, Olivia, Owen, Oakley and Oaklynn.

Browse O names by beginning, Oa to Oz

Most popular O names in 2025

Girls

Most popular O girl names in the U.S., 2025
Rank	Name	Babies
1	Olivia	13,544
153	Oaklynn	1,964
156	Oakley	1,933
197	Olive	1,597
264	Ophelia	1,183
308	Octavia	982
423	Opal	740
535	Oaklee	565
637	Oaklyn	456
666	Oakleigh	423
785	Ocean	345
881	Odette	303
1,192	Odessa	193
1,406	Onyx	155
1,777	Oriana	113
2,139	Ofelia	87
2,194	Olympia	84
2,276	Ollie	80
2,514	Ozzy	70
2,514	Orla	70
2,751	Oona	62
2,933	Ottilie	57
2,957	Odelia	56
3,028	Oaklie	54
3,067	Orianna	53

Boys

Most popular O boy names in the U.S., 2025
Rank	Name	Babies
3	Oliver	14,939
31	Owen	7,190
223	Oscar	1,620
260	Omar	1,333
277	Otto	1,241
334	Orion	1,012
365	Onyx	881
454	Oakley	688
501	Odin	604
548	Ozzy	548
652	Otis	422
686	Omari	397
707	Ozias	381
717	Ocean	375
871	Orlando	275
996	Oziel	229
1,056	Ollie	207
1,075	Osiris	200
1,156	Osman	181
1,183	Oren	174
1,244	Oakland	160
1,276	Octavio	154
1,401	Osvaldo	130
1,425	Orson	126
1,451	Osiel	123

All O names by beginning

Other O names

Beginnings with fewer than 20 names: Oe, Of, Og, Oi, Oj, Oo, Ou, Ow, Ox and Oy.

Name colours: Girl Boy Unisex

O names on the rise