Achternamen
| Achternaam | Aantal |
|---|---|
| Koorman | 2 |
| Koorn | 1 |
| Koort | 1 |
| Koos | 1 |
| Koose | 3 |
| Koot | 22 |
| Koot, van | 1 |
| Kooten, van | 10 |
| Kooter | 4 |
| Kootkar | 1 |
| Kootstra | 1 |
| Kootwijk | 1 |
| Kooy | 3 |
| Kooy, van de | 2 |
| Kooy, van der | 3 |
| Kooyman | 8 |
| Kooymans | 5 |
| Kop | 7 |
| Kop, van den | 1 |
| Kop, van der | 5 |
| Kopcinska | 1 |
| Kopczynski | 1 |
| Kopec | 2 |
| Koper | 4 |
| Koperberg | 3 |