Achternamen
| Achternaam | Aantal |
|---|---|
| Kosman | 8 |
| Kosmann | 2 |
| Kosse | 2 |
| Kossen | 3 |
| Kossmann | 1 |
| Kost | 1 |
| Kosten | 1 |
| Koster | 45 |
| Koster, de | 11 |
| Kosterman | 3 |
| Kostermans | 3 |
| Kösters | 71 |
| Kostjens | 19 |
| Kostons | 10 |
| Kostrzewa | 1 |
| Kostwinder | 1 |
| Koszyk | 1 |
| Koten | 27 |
| Kotenko | 1 |
| Koter, de | 1 |
| Kothuis | 1 |
| Kotkamp | 3 |
| Kotlewski | 1 |
| Kotte | 2 |
| Kötter | 1 |