| Name | Meaning | Gender | Origin |
| OJufemi | Beloved of the gods. | F | Egyptian |
| Okal | To Cross | E | African |
| Okalani | Heaven | F | Hawaiian |
| Okapi | Animal with Long Neck | E | African |
| Oke | Form of OSCAR | E | Hawaiian |
| O'keefe | Surname. | M | Irish |
| Okes | From the oak. | M | English |
| Okhmhaka | Little wolf (Cheyenne). | M | Native American |
| Oki | Ocean Centered | F | Japanese |
| Okie | from Oklahoma | M | American |
| Okoth | Born when it was Raining | E | African |
| Okpara | First born. | M | Egyptian |
| Oksana | God is With Us | F | Slavic |
| Oksanochka | Praise be to God. | F | Russian |
| Ol | Legendary son of Olwydd. | M | Welsh |
| Ola | Life; well-being. | F | Hawaiian |
| Olabisi | Brings joy. | F | Egyptian |
| Olaf | Ancestor | M | Scandinavian |
| Olathe | Lovely/ Beautiful | F | Native American |
| Olaug | Of the ancestors. | F | Norse |
| Olav | Variant of Olaf: Relic; ancestral heritage. | M | Norse |
| Olave | Variant of Olaf: Relic; ancestral heritage. | M | Norse |
| Oldwin | Special friend. | F | English |
| Oldwina | Special friend. | F | English |
| Oldwyn | Special friend. | F | English |
| Ole | Family. | M | Danish |
| Olechka | Holy. | F | Russian |
| Oleda | Winged. | F | English |
| Oleg | Sacred | M | Slavic |
| Oleif | Relic descendant. | M | Norse |
| Oleisia | Protector of man. | F | Greek |
| Olen | Relic. | M | Norse |
| Olena | Light. | F | Greek |
| Olencia | Not available | F | American |
| Olenka | Holy. | F | Russian |
| Oles | Defender of man. | M | Greek |
| Olesia | Protector of Humanity | F | Polish |
| Oleta | Winged. | F | English |
| Oletha | Light; nimble. | F | English |
| Olethea | Honest. | F | Latin |
| Olethia | Honest. | F | Latin |
| Olexa | Feminine of Alexander. | F | Czechoslovakian |
| Olezka | Holy. | M | Russian |
| Olga | Holy | F | Scandinavian |
| Oliana | From Oleander | F | Hawaiian |
| Olin | Of the Ancestors | E | Scandinavian |
| Olina | Joyous | F | Hawaiian |
| Olinda | Form of YOLANDA | F | Latin |
| Oline | Joyous. | F | Hawaiian |
| Oliphant | Great strength. | M | Scottish |