Individuals
A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | - | ( | … | None
| Surname | Individuals | ||
|---|---|---|---|
| O'Brien | O'BRIEN | 18 | 18 |
| O'Neill | O'NEILL | 4 | 4 |
| Obolensky | OBOLENSKY | 2 | 2 |
| Oettingen-Oettingen | OETTINGEN-OETTINGEN | 1 | 1 |
| Ogilvy | OGILVY | 6 | 6 |
| Ogston | OGSTON | 1 | 1 |
| Oldenburg Oldenburg | OLDENBURG | 69 2 71 | 71 |
| Ollén | OLLÉN | 1 | 1 |
| Onley | ONLEY | 1 | 1 |
| Orange-Nassau | ORANGE-NASSAU | 41 | 41 |
| Orléans d'Orléans de Orleans | ORLÉANS | 13 7 1 21 | 21 |
| Orléans-Braganza | ORLÉANS-BRAGANZA | 1 | 1 |
| Orléans-Galliera | ORLÉANS-GALLIERA | 4 | 4 |
| Ottonian | OTTONIAN | 3 | 3 |
| Ottonian Dynasty | OTTONIAN DYNASTY | 1 | 1 |
| Ovtchinnikova | OVTCHINNIKOVA | 1 | 1 |