| Naam | Aantal | Naam | Aantal |
|---|---|---|---|
| Y Y Y Y Bobadilla | 1 | Yoka | 8 |
| Yabohuo | 1 | Yon | 63 |
| Yachou | 1 | Young | 12 |
| Yakub | 1 | Yousfi | 1 |
| Yalcin | 8 | Yperen, Van | 1 |
| Yalcinkaya | 1 | Yperman | 3 |
| Yalcintas | 4 | Ypersele De Strihou, Van | 4 |
| Yanikoglu | 4 | Ypersele, Van | 2 |
| Yans | 2 | Yper, Van | 3 |
| Yaoti | 1 | Yperzeele, Van | 3 |
| Yarazusta | 3 | Ysbeen | 1 |
| Yasar | 2 | Ysebaert | 15 |
| Yattioui | 1 | Yseboodt | 1 |
| Yavas | 4 | Ysebrandt | 3 |
| Yaznasni | 1 | Ysebrant | 3 |
| Yck, Van | 2 | Ysenbaardt | 2 |
| Ydegem, Van | 1 | Ysenbaert | 1 |
| Ydens | 1 | Ysendijck, Van | 1 |
| Yee | 10 | Yserbyt | 1 |
| Yener | 4 | Ysewijn | 170 |
| Yerna | 1 | Yu | 2 |
| Yeste | 3 | Yucel | 1 |
| Yeun | 1 | Yuen | 10 |
| Yhines | 1 | Yuksel | 1 |
| Yigit | 1 | Yuliette | 1 |
| Yildie | 1 | Yumakaeva | 1 |
| Yildiz | 14 | Yvart | 1 |
| Yilleux | 1 | Yvens | 1 |
| Yilmaz | 6 | Yzermans | 1 |