| Name | # Entries |
|---|---|
| Yasso | 18 |
| Yasuda | 11 |
| Yasukawa | 4 |
| Yasutake | 1 |
| Yata | 2 |
| Yateem | 1 |
| Yasnitskaya | 1 |
| Yastreboff | 0 |
| Yasumoto | 2 |
| Yatim | 8 |
| Yatham | 3 |
| Yatsenko | 4 |
| Yatta | 5 |
| Yatzis | 1 |
| Yaun | 14 |
| Yavan | 3 |
| Yavlinsky | 1 |
| Yavuzel | 1 |
| Yawari | 9 |
| Yawney | 2 |
| Yawaringu | 0 |
| Yaw Hsien | 0 |
| Yayalo | 3 |
| Yaylaci | 1 |
| Yazarloo | 2 |
| Yazarlou | 1 |
| Yazawa | 3 |
| Yazdandoost | 2 |
| Yazerly | 0 |
| Yaziji | 1 |
| Yazxhi | 3 |
| Yazdan | 3 |
| Yazgi | 1 |
| Yazidi | 0 |
| Ybarlucea | 5 |
| Ybarra | 0 |
| Ybarzabal | 2 |
| Ycsiar | 1 |
| Ye | 565 |
| Yazmadjian | 1 |
| Yeager | 0 |
| Yeak | 4 |
| Yea Lan | 1 |
| Yeardye | 2 |
| Yeates Vesper | 0 |
| Yegenian | 2 |
| Yegudkin | 3 |
| Yegen | 2 |
| Yel | 8 |
| Yehuda | 2 |
| Yelde | 1 |
| Yelding | 1 |
| Yelamanchi | 1 |
| Yeleser | 3 |
| Yelimenati | 1 |
| Yellala | 1 |
| Yeldhan | 1 |
| Yellin | 2 |
| Yema | 1 |
| Yemenian | 1 |
| Yellanki | 1 |
| Yemettas | 3 |
| Yen Ching | 0 |
| Yendle | 10 |
| Yenice | 7 |
| Yenigella | 3 |
| Yenne | 2 |
| Yenneos | 1 |
| Yenofkian | 1 |
| Yeoland | 6 |
| Yeom | 28 |
| Yeok | 1 |
| Yuhico | 1 |
| Yuenman | 0 |
| Yug | 1 |