Achternamen
| Achternaam | Aantal |
|---|---|
| Janski | 1 |
| Jansma | 1 |
| Jansman | 1 |
| Jansom | 2 |
| Janson | 7 |
| Jansonius | 1 |
| Janss | 6 |
| Janssen | 4050 |
| Janssen Bouwmeester | 1 |
| Janssen de Limpens | 4 |
| Janssen Lok | 1 |
| Janssen van Son | 3 |
| Janssen-Steenberg | 1 |
| Janssens | 261 |
| Janssens de Bisthoven | 1 |
| Janssens de Varebeke | 1 |
| Janssenswillen | 1 |
| Janssis | 1 |
| Jansson | 1 |
| Jansz | 1 |
| Janszen | 6 |
| Janus | 7 |
| Janusch | 1 |
| Janussen | 2 |
| Janvier | 1 |