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| Name | Total | Name | Total | Name | Total | Name | Total | Name | Total |
|---|
| Unknown | 122 | Ulster, of | 1 | ua Nuallain | 3 | Upchurch | 1 | Ui Fothairt | 1 |
| Umphraville, de | 1 | Ulmer | 5 | Ungarnmark, in der | 1 | Uzes, D' | 1 | Ui Tallain Roirend, Of | 1 |
| Ufford Justiciar of Ireland, de | 1 | Unready, the | 1 | Upton | 1 | Ufford | 1 | Ua MORDA, King Of Leix | 2 |
| Ufford, de | 1 | Ua Tuathail | 11 | Ussery | 1 | Uplands | 1 | Ua CAELLUIDHE | 1 |
| Urman, of | 1 | Upper Lorraine, of | 2 | Urquhart | 2 | Ui DUNLAINGE, King Of Laigin & Leinster | 22 | Ua CHAELLUIDE | 1 |
| Urach Arberg, von | 1 | Umfreville, de | 2 | Upshaw | 2 | Ui DUNLAINGE | 2 | Uplands, The | 1 |
| UnderKing of Vestfold | 3 | Urchada | 1 | Underwood | 1 | Ui Cheinnselaig King Of Laigin & Leinste | 15 | Ullery | 1 |
| Uzes, de | 1 | ua Morda | 8 | Utsey | 3 | UnderKing In Vestfold | 2 | Unmarried | 5 |
| UnderKing of Trondheim | 1 | ua Caellaide | 2 | Urbina | 1 | Ui Bairrchi | 1 | - | - |
| Urban | 1 | ua Imar | 1 | Urey | 1 | Ui Cellaig Of Ui Bairrchi | 1 | - | - |
| Urgel, de | 1 | ua Braenain | 1 | Updefraieff | 1 | Ui Teig Cometa | 1 | - | - |
| UnderKing of Kent | 1 | ua Domnaill | 1 | Urqhardt | 1 | Ui Mail | 1 | - | - |
