| IAGO, Crisli Verch | B. Abt 993 | |||
| IAGO, Custennin "Ddu" Ap | B. Abt 935 | D. 980 | ||
| IAGO, Owain Ap | B. Abt 940 | |||
| IAGO, Tangwystl Verch | B. Abt 1020 | D. Aft 1075 | ||
| IARETH, Enoch Henoch 'The Initiated' ibn Jared Yered | B. 3382 B.C. | D. 3017 B.C. | ||
| IBERS, Gregg | B. 1952 | |||
| IBERS, Rod | B. 19 Jan 1927 | |||
| IBERS, Teresa Lynne | B. 28 Jul 1959 | |||
| IBERS, Wayne | B. 19 Feb 1950 | |||
| IBN ENOCH HENOCH, Methusaleh Mathusale | B. 3317 B.C. | D. 2348 B.C. | ||
| IBN METHUSALEH MATHUSALE, Laamech Lemekh | B. Abt 3130 B.C. | D. 2353 B.C. | ||
| IBN NOAH NUH NOE, Ham Cham Chain progenitor of Africa | ||||
| IBN NOAH NUH NOE, Japhet Iaphet progenitor of Europe and Central Asia | B. Aft 2452 B.C. | |||
| IDUMAEAN, Antipater The | ||||
| IDWAL, Cynan Ap | B. Abt 915 |
| IDWAL, Iago Ap | B. 908 | D. 979 | ||
| IDWAL, Idwal 'Fychan' Ap | B. Abt 912 | |||
| IDWAL, Meurig Ap | B. 917 | D. 986 | ||
| IDWAL, Rhodri 'Molwynog' Ap | B. Abt 690 | D. 754 | ||
| IDWAL, Rhodri Ap | B. Abt 910 | D. 968 | ||
| IDWAL, UNK Mrs. Iago Ap | B. Abt 915 | |||
| IDWAL, UNK Mrs. Meurig Ap | B. Abt 921 | |||
| IDWAL, UNK Mrs. Meurig Ap | B. 923 | |||
| IDWAL, UNK Mrs. Rhodri Ap | B. Abt 700 | |||
| IDWALLON, Ithel Ap | B. Abt 929 | |||
| IESTYN, Catrin Verch | B. 1069 | |||
| IEUAN, Elen Verch | B. Abt 1372 | |||
| IEUAN, Elen Verch | B. 1325 | |||
| IEUAN, Evan Ap | B. Abt 1380 | |||
| IEUAN, Gwenhwyfar Verch | B. 1300 |
| IEUAN, Joan Ferch | B. 1280 | |||
| IEUAN, Llewelyn Ap | B. Abt 1381 | |||
| IEUAN, Madog Ap | B. Abt 1370 | |||
| IEUAN, Mathew Ap | B. Abt 1366 | D. Aft 1419 | ||
| IEUAN, Maud Verch | B. Abt 1387 | |||
| IEUAN, Owen Ap | B. Abt 1383 | |||
| IEUAN, Rhys Ap | B. Abt 1385 | |||
| IEVAN, Jenkin Ap | ||||
| IFOR, Cuhelyn Ap | B. Abt 907 | |||
| IFOR, Llywelyn Ap | B. Abt 1282 | |||
| ILIUM, Batea Asia | ||||
| IMMEDINGER, UNK Miss of | ||||
| INGALDESTHORPE, Isabel | B. 1435 | D. 20 May 1476 | ||
| INGALLS, Clarissa J | B. 23 Nov 1858 | |||
| INGALLS, Earnest F. | B. 1874 |
| INGALLS, Emma Eliza | B. 5 May 1868 | D. 16 Aug 1939 | ||
| INGALLS, Fannie Clifton | B. 4 Nov 1861 | D. 25 Feb 1940 | ||
| INGALLS, George H | B. 1864 | |||
| INGALLS, James | B. 1816 | |||
| INGALLS, William H | B. 1863 | D. 29 Sep 1943 | ||
| INGERSOLL, Elizabeth | B. 11 Mar 1672/73 | D. 26 Feb 1727/28 | ||
| INGERSOLL, John | B. 7 Nov 1674 | D. 11 Nov 1675 | ||
| INGERSOLL, John | B. 11 Mar 1619/20 | D. 3 Sep 1684 | ||
| INGERSOLL, Nathaniel | B. 1676 | D. 1704 | ||
| INGERSOLL, Nathaniel | B. 22 Dec 1647 | D. 1 Apr 1683 | ||
| INGERSOLL, Richard | B. 1 Sep 1651 | D. 27 Nov 1683 | ||
| INGJALDSSON, Hrolf | B. 700 | |||
| INGLEBY, David | ||||
| INGLES, Clara Elissa OR Clarissa UNK Mrs. Lewis | ||||
| INGLES, James | B. 1816 |
| INGLES, Lewis | ||||
| INGLES, William R. | B. 20 Jan 1827 | D. 22 Aug 1901 | ||
| INGVARSSON, Mrs Onund Braut | B. 643 | D. 660 | ||
| INGVARSSON, Onund 'Braut' | B. Abt 638 | D. 660 | ||
| INGVARSSON, Skira | B. Abt 566 | |||
| INGVARSSON, UNK Mrs. Skira | B. Abt 627 | |||
| INIGUEZ, Assona | ||||
| INNES, UNK | ||||
| INNES, Walter of that ilk | ||||
| IORWERTH, Dyddgu Verch | B. Abt 1060 | |||
| IORWERTH, Gruffydd ap | ||||
| IORWERTH, Llywarch 'Goch' Ap | B. Abt 1139 | |||
| IRBY, Olive | B. 1547 | D. 10 Mar 1614/15 | ||
| IRELAND, Achtan UNK Mrs. Art Mac Cuinn of | ||||
| IRELAND, Agnes of | B. 1312 |