Starting with letter O
| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 141 | Ollaneg | English | From Olney. | M | |
| 142 | Ollie | French | Diminutive of Oliver: Olive tree. | M | |
| 143 | Ollie | German | Diminutive of Oliver: Elf army. Can also be a variant of Olaf: Relic, ancestral heritage. | M | |
| 144 | Ollie | Latin | Diminutive of Oliver: Olive (symbol of peace); peaceful. | M | |
| 145 | Olliver | Latin | Peaceful. | M | |
| 146 | Olney | English | From Olney. | M | |
| 147 | Olof | Norse | Relic. | M | |
| 148 | Olof | Swedish | Andent. | M | |
| 149 | Olvaerr | Norse | Affectionate. | M | |
| 150 | Olvan | Latin | Peaceful. | M | |
| 151 | Olvir | Norse | Affectionate. | M | |
| 152 | Olwydd | Welsh | Tracker. | M | |
| 153 | Olympas | Biblical | Heavenly. | M | |
| 154 | Olyn | Norse | Relic. | M | |
| 155 | Om | Norse | Father of Idunn. | M | |
| 156 | Omar | Muslim | Variant of Omar: Life. Long living.. | M | |
| 157 | Omar | Arabic | Long-lived. | M | |
| 158 | Omar | Biblical | He that speaks; bitter | M | |
| 159 | Omar | Hebrew | Eloquent. Speaker. The grandson of Esau in the Old Testament. Famous Bearers: 12th century Persian poet and astronomer and mathematician Omar Khayyam; Caliph Omar II, who made Islam an imperial power; actor Omar Sharif. | M | |
| 160 | Omar | Muslim | Life. Long living.. | M | |