Achternamen
| Achternaam | Aantal |
|---|---|
| Janzen | 4 |
| Janzing | 1 |
| Janzon | 1 |
| Japink | 1 |
| Jarabik | 1 |
| Järc | 1 |
| Jardin | 3 |
| Jarvis | 1 |
| Jas | 1 |
| Jasker | 1 |
| Jaskier | 1 |
| Jaskulla | 1 |
| Jaspar | 37 |
| Jaspars | 9 |
| Jaspart | 1 |
| Jasper | 2 |
| Jaspers | 185 |
| Jaspers Focks | 1 |
| Jaspers-Foks | 1 |
| Jasperse | 5 |
| Jassen | 1 |
| Jastram | 1 |
| Jastrzembski | 1 |
| Jaszewski | 1 |
| Jaumain | 1 |