| YA | 1 |
| YACA | 1 |
| YACK | 3 |
| YACKI | 1 |
| YAGA | 4 |
| YAGO | 1 |
| YAH | 1 |
| YAK | 4 |
| YAK II | 1 |
| YAKI | 3 |
| YAKO | 1 |
| YALI | 1 |
| YALOU | 1 |
| YALTA | 1 |
| YAMAHA | 1 |
| YAMOUR | 1 |
| YAN | 2 |
| YANA | 1 |
| YANADIS | 1 |
| YANCHO | 1 |
| YANE | 1 |
| YANET | 1 |
| YANK | 2 |
| YANKEE | 6 |
| YANKEE DOODLE AT SILVANUS | 1 |
| YANKI | 2 |
| YANN | 1 |
| YANNE | 1 |
| YAP | 1 |
| YAQUI | 1 |
| YARA | 3 |
| YARD | 1 |
| YARI | 1 |
| YARN | 1 |
| YAVELEUR | 1 |
| YBIS | 1 |
| YCA | 1 |
| YCK | 1 |
| YEDRA | 1 |
| YEIKO | 1 |
| YEIN | 1 |
| YELL | 1 |
| YELLOW | 1 |
| YELLOW BUNTING | 1 |
| YEN | 1 |
| YENI | 1 |
| YENIBLUEMOON | 1 |
| YENKA | 1 |
| YENNI | 1 |
| YENNY | 1 |
| YERA | 1 |
| YERAI | 1 |
| YES | 1 |
| YES DA QUINTA DO MEIRINHO | 1 |
| YESA | 1 |
| YESICA | 1 |
| YESSI | 1 |
| YESY | 1 |
| YETTE | 1 |
| YFF | 1 |
| YGOR | 2 |
| YILLETTE | 1 |
| YINA | 2 |
| YINA DE BOSENDE | 1 |
| YIPPEE | 1 |
| YIYA | 1 |
| YNA | 1 |
| YNDIO | 2 |
| YOA | 1 |
| YOBIA | 1 |
| YOBYA | 1 |
| YOCASTA | 1 |
| YODI | 1 |
| YOGA | 3 |
| YOK | 1 |
| YOLA | 5 |
| YOLA GAMINE | 1 |
| YOLE | 3 |
| YOLI | 1 |
| YOM | 1 |
| YON | 4 |
| YORCK | 1 |
| YORE | 2 |
| YORI | 1 |
| YORI I | 1 |
| YORK | 9 |
| YORK'S DORA GLADSTONE | 1 |
| YOTA | 3 |
| YOU | 1 |
| YOUGHI | 1 |
| YOUKETTE | 1 |
| YOUMA | 1 |
| YOUNA | 1 |
| YOUNG KATE | 1 |
| YOUNG ROB ROY | 1 |
| YOUNG ROLLICK | 1 |
| YOUNG WHITE (HARTLEY'S) | 1 |
| YOUPETTE | 1 |
| YOUSI | 1 |
| YOUTE | 1 |
| YOUTTE | 1 |
| YOYO | 1 |
| YPRES | 1 |
| YRCA | 1 |
| YRIS | 1 |
| YS | 1 |
| YSA | 1 |
| YSS | 1 |
| YTACA | 1 |
| YTALIA | 1 |
| YTIS | 1 |
| YUBA | 3 |
| YUCA | 1 |
| YUDA | 1 |
| YUDI | 2 |
| YUKA | 1 |
| YUKI | 1 |
| YUKON | 1 |
| YULA | 1 |
| YULI | 2 |
| YULIA | 1 |
| YUMA | 10 |
| YUNA | 2 |
| YURI | 3 |
| YURRE | 1 |
| YURY | 3 |
| YUSS | 1 |
| YUTA | 1 |
| YVONNE | 1 |
| YZARA | 1 |