Nomina propria O
| Oem | → | Nicolaus | Cartusiani BE - N |
| Oesteruit | → | Bartholomeus (de) O(e)sterwijck | Cartusiani BE - B |
| O(e)sterwijck | → | Bartholomeus | Cartusiani BE - B |
| Oesterwijt | → | Bartholomeus (de) O(e)sterwijck | Cartusiani BE - B |
| Oestmal | → | Adrianus | Cartusiani NL - A |
| Oerdren | → | Gerardus (de) Oorderen | Cartusiani BE - G |
| Of(f)huys | → | Franco | Cartusiani NL - F |
| Oorderen | → | Gerardus | Cartusiani BE - G |
| Oors | → | Joannes | Cartusiani BE - J |
| Opdenbergh | → | Amandus | Cartusiani BE - A |
| Ottonis | → | Bart(h)oldus | Cartusiani NL - B |
| Ottonis | → | Bartholomeus | Cartusiani NL - B |
| Oudenaert | → | Daniel (de) Aldenardo I | Cartusiani BE - D |
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