| Name | # Entries |
|---|---|
| Young | 7783 |
| Yang | 4250 |
| Yates | 2183 |
| Yorks | 760 |
| Yan | 750 |
| Yuan | 746 |
| Yao | 708 |
| Yin | 664 |
| Yap | 626 |
| Yeo | 620 |
| Yeung | 573 |
| Yuen | 534 |
| Yip | 509 |
| Yeoman | 486 |
| Yoon | 468 |
| Yousif | 401 |
| Ying | 383 |
| Youssef | 382 |
| Yun | 379 |
| Yeats | 355 |
| You | 330 |
| Yen | 324 |
| Younan | 301 |
| Yeh | 275 |
| Yau | 261 |
| Yue | 261 |
| Yule | 217 |
| Younes | 214 |
| Yilmaz | 212 |
| Yim | 206 |
| Yusuf | 199 |
| Yung | 197 |
| Yardley | 192 |
| Yacoub | 159 |
| Yamada | 156 |
| Youngman | 148 |
| Yiu | 134 |
| Yum | 128 |
| Yam | 102 |
| Yousef | 93 |
| Yeatman | 91 |
| Yamamoto | 90 |
| Yoshida | 72 |
| Yow | 68 |
| Yasin | 66 |
| Youse | 66 |
| Yousuf | 60 |
| Yamaguchi | 59 |
| Yonan | 55 |
| Yager | 49 |
| Yon | 46 |
| Yazdani | 41 |
| Yamashita | 38 |
| Yearsley | 35 |
| Yarrington | 33 |
| Yetman | 33 |
| Yeboah | 32 |
| Yandle | 27 |
| Yelverton | 25 |
| Yanni | 25 |
| Yamanaka | 23 |
| Yokoyama | 22 |
| Yanko | 22 |
| Yamauchi | 19 |
| Yoshikawa | 19 |