| Name | aka | Birth date | Birth location | Marriage date | Marriage location | Death date | Death location |
| Harriet Louisa Hughes | | April 8, 1846 | | | | | |
| James Barnett Hughes | | July 20, 1852 | | | | | |
| John Cutting Hughes | | December 25, 1859 | | | | | |
| Mary J. C. Hughes | | April 1, 1842 | Holderness, New Hampshire | July 31, 1865 | Holderness, New Hampshire | 1905 | Waterloo, Wisconsin |
| Mary Jane Clark Hughes | | April 1, 1842 | | | | | |
| Humbert I, Count of Maurienne & Savoy | | Abt. 1062 | Savoie, France | 1090 | | October 17, 1103 | |
| Humbert III, Comte De Savoy | | August 1, 1136 | Savoy, France | | | March 4, 1188/89 | |
| Alfred Charles Hunt | | | | | | | |
| Julia Hunt | | 1867 | | | | 1952 | |
| William Pittman (Trip) Huxley III | | April 1, 1968 | Staten Island, New York | | | | |
| William Pittman Huxley, Jr. | | May 29, 1938 | | December 4, 1965 | | | |
| Hwala | | | | | | | |
| Hywel Dda (the Good) ap Cadell | | | | | | 950 | |
| Iago ap Beli | | | | | | 613 | |
| Iago ap Idwal, Prince of Gwynedd | | | | | | 1039 | battle |
| Ida | | WFT Est. 1092-1127 | | WFT Est. 1125-1146 | | WFT Est. 1126-1212 | |
| Ida of Namur | | Abt. 1078 | Namur, Belgium | Abt. 1099 | Belgium | Aft. 1117 | |
| Dyddgu Verch Idnerth | | 1060 | Wales | WFT Est. 1101-1123 | | WFT Est. 1101-1155 | |
| Idwal ap Cadwaladr | | | | | | 712 | |
| Idwal ap Meurig, King of North Wales | | | | | | 996 | |
| Idwal Foel (the Bald) ap Anarawd | | | | | | 942 | battle |
| Igor I, Prince of Kiev | | Abt. 875 | Novogorod, Kiev | 903 | | 945 | |
| Ingelgerius | Ingelger | | | | | | |
| Ingenach | Lleian | | | | | | |
| Ingild | | | | | | 718 | |
| Ingram | | | | | | | |
| Frances Innes | Ennis, Frances | | | | | | |
| William Innes | | | | | | 1684 | |
| Iorwerth Drwyndwn ap Owain Gwynedd | Broken-Nosed", "the | 1130 | Abberffraw, Anglsy, Wales | WFT Est. 1162-1181 | | Abt. 1174 | Pennant Mehangell |
| Irmengard of Hesbain | | Abt. 778 | | 798 | | October 3, 818 | |
| Irmgard | | | | 867 | | | |
| Isabel | | Abt. 1199 | England | Abt. 1229 | | WFT Est. 1249-1294 | |
| Isabel | | WFT Est. 1236-1289 | | WFT Est. 1271-1319 | | WFT Est. 1271-1367 | |
| Isabella of Castille | | | | Abt. March 1, 1371/72 | Hertford Castle | | |
| Isabella of France | | 1292 | France | WFT Est. 1320-1326 | | August 22, 1358 | Hertford Castle, Hertford, England |
| Isabelle of Aragon | | 1247 | Aragon, Spain | May 28, 1262 | | January 28, 1270/71 | |
| Itermon | | | | | | | |
| Itta | | | | | | | |
| Earl of the Uplands Ivar | | | | | | | |
| Ohno Esther Jackson | | February 18, 1898 | | | | December 3, 1988 | |
| Jacquetta of Luxembourg | | Abt. 1416 | | Bef. March 23, 1435/36 | | | |
| James I, King of Aragon | | WFT Est. 1186-1219 | | September 8, 1235 | | WFT Est. 1249-1304 | |
| Nathaniel Jarmon | | | | | | | |
| Jean I, Count of Ponthieu | | WFT Est. 1126-1148 | | WFT Est. 1169-1187 | | 1191 | |
| Jeanne, Queen of France | | January 1272/73 | France | August 16, 1284 | | April 2, 1305 | |
| Joan | Margaret | Abt. 1200 | Raby, With Keverstone, Staindrop, Durham, England | Abt. 1222 | Durham, England | Aft. 1247 | |
| Johanna of Ponthieu | | 1208 | | 1237 | Burgos, Spain | March 5, 1278/79 | Abbeville, France |
| John II, Count of Hainault & Holland | | 1251 | Brabant, Brabant, Holland | WFT Est. 1282-1301 | | August 22, 1304 | |
| John of Avesnes, Count of Hainault | | 1218 | Etroeungt, Nord, France | September 1246 | | December 24, 1257 | |
| John of Gaunt, Duke of Lancaster | | March 1339/40 | St. Bavon's Abbey, Ghent, Flanders, Belgium | January 13, 1395/96 | Lincoln Cathedral, Lincoln, England | February 3, 1398/99 | Leicester Castle, England |