| Namn | Licens | Födelseår | Far | Mor | Morfar |
|---|---|---|---|---|---|
| Uncle Hunter | 1814 | 1977 | Utrillo | Sombrero | |
| Uncle Oscar | 13546 | 1974 | Filipin | Iliad | |
| Uncle Philip | 14037 | 1974 | Filipin | Idealist | |
| Uncle Tim | 5799 | 1976 | Carnival Night | ||
| Under Cover | 998726 | 1995 | Under World xx | Finette xx | Northern Baby xx |
| Under Cover | 991963 | 1996 | |||
| Under Cover | 235469 | 2001 | Ohorn | Irene | Burggraf |
| Under Cover | 258501 | 2004 | Calato | Lacalanda | Calando I |
| Underberg | 16033 | 1983 | Jaguar | Cyress | Cyrano |
| Underberg | 246657 | 2002 | Songline | Snowball | Atlantic Boy |
| Underboy | 200124 | 1995 | Underworld xx | Bold Irish xx | |
| Undercover | 227458 | 2000 | Underworld xx | La Barola | Paroll |
| Undercover | 229438 | 2001 | Heartbreaker | Cadiz du Rona Z | Carthago |
| Undercover | 232568 | 2001 | Frisbee Kerellec | Popcorn | Animo |
| Undercover | 244082 | 2001 | Ircolando | Romein 2 | Landeur |
| Undercover V | 234804 | 2001 | Elmshorn | Icanita | Voltaire |
| Underground Ek | 251817 | 2005 | Undercover | Calista EK (70) (SWB) | Casir Ask |
| Underhöjs Charmeur | 215092 | 1989 | Corso | Seneka | Garant |
| Underworld xx | 1986 | Riverman xx | Satania xx | Ruritania xx | |
| Undicci | 248387 | 2004 | Camiell-Flamingo Z | Donatella (F. 2) (SWB) | Cardento |
| Undici | 217968 | 1996 | Magini | Lindy | Nebraska |
| Undine | 1975 | Unikum | Roulette | Niarchos | |
| Undine | 73610 | 1977 | Samurai ox | Ujiji | |
| Undine | 46671 | 1980 | Utrillo | Furidine | Furidant |
| Undine | 233093 | 2001 | Jeopardy | Chantal | Nimmerdor |
| Undis | 22837 | 1987 | Ymp | Uniz | Unvin |
| Undock | 47644 | 1978 | Unman | Docka | |
| Undra | 900611 | 1976 | Ganesko | Orkan | |
| Undra | 14172 | 1980 | Utrillo | Fiona | Dawson |
| Undra | 240834 | 1999 | Warstiener | Unnur | Urbino |