| Name | M/F | Meaning |
|---|---|---|
| Oak | ![]() |
Meaning : Place Name:near The Oak Trees, From The Oak Tree Meadow Used in : British, English |
| Olaf-erik | ![]() |
Meaning : Used in : German |
| Olaf-hendrik | ![]() |
Meaning : Used in : German |
| Oldik | ![]() |
Meaning : Used in : Czechoslovakian |
| Oldrik | ![]() |
Meaning : Used in : German |
| Ole-frank | ![]() |
Meaning : Used in : German |
| Ole-frederik | ![]() |
Meaning : Used in : German |
| Ole-hendrick | ![]() |
Meaning : Used in : German |
| Olek | ![]() |
Meaning : Used in : Australian |
| Olik | ![]() |
Meaning : Used in : Australian |
| Oliver-jack | ![]() |
Meaning : Used in : Australian |
| Oliver-patrick | ![]() |
Meaning : Used in : German |
| Oliver-patrik | ![]() |
Meaning : Used in : German |
| Olok | ![]() |
Meaning : Used in : Bengali |
| Olrik | ![]() |
Meaning : Used in : French, German |
| Omar-marek | ![]() |
Meaning : Used in : German |
| Omerfaruk | ![]() |
Meaning : Used in : Australian |
| Ondrasek | ![]() |
Meaning : Used in : Czechoslovakian |
| Onik | ![]() |
Meaning : A brave soldier Used in : Sanskrit |
| Onofiok | ![]() |
Meaning : Used in : Australian |
| Orick | ![]() |
Meaning : From The Ancient Oak Tree Used in : American, British, English |
| Orik | ![]() |
Meaning : From The Ancient Oak Tree Used in : American, British, English |
| Orrick | ![]() |
Meaning : From The Ancient Oak Tree Used in : American, Australian, British, English |
| Orrik | ![]() |
Meaning : From The Ancient Oak Tree Used in : American, British, English |
| Oskar-erik | ![]() |
Meaning : Used in : German |
| Oskarek | ![]() |
Meaning : Used in : Czechoslovakian |
| Osman-aytak | ![]() |
Meaning : Used in : German |
| Osmanek | ![]() |
Meaning : Used in : Arabic |
| Osok | ![]() |
Meaning : Used in : Bengali |
| Ospak | ![]() |
Meaning : Brother Of Gudrun. Used in : Norse |
| Osrick | ![]() |
Meaning : Divine Ruler Used in : American, Australian, British, English, German |
| Osrik | ![]() |
Meaning : Divine Ruler Used in : American, British, English, Teutonic |
| Otakarek | ![]() |
Meaning : Used in : Czechoslovakian |
| Otek | ![]() |
Meaning : In Polish meaning is : Wealthy, Fortune Used in : Czechoslovakian, German, Polish |
| Otik | ![]() |
Meaning : In czech meaning is : Wealthy Used in : Czechoslovakian, Czech, German, Teutonic |
| Otto-frank | ![]() |
Meaning : Used in : German |
| Ozguk | ![]() |
Meaning : Used in : Australian |
| Ozturk | ![]() |
Meaning : Used in : Australian |