| Name | aka | Birth date | Birth location | Marriage date | Marriage location | Death date | Death location |
| Hannah Jones | | 1800 | | | | January 11, 1839 | Boardman Township, Ohio |
| Joscelin de Louvaine | | 1130 | Egmanton, Nottinghamshire, England | Aft. 1154 | Egmanton, Nottinghamshire, England | 1189 | Egmanton, Nottinghamshire, England |
| Josceline of Pont-Audemer | | | | | | | |
| Hannah Jose | | | | | | | |
| Judith | | | | | | | |
| Judith | | Abt. 844 | | 862 | | | |
| Judith of Bavaria | | | | 819 | | 843 | |
| Judith of Bavaria | | Abt. 925 | | 938 | | June 28, 987 | |
| Judith of Bavaria | | Abt. 1103 | Bavaria | 1120 | | February 22, 1124/25 | |
| Judith of Brittany | | Abt. 982 | | Abt. 1000 | | 1017 | |
| Judith of Fiuli | | | | Abt. 910 | | | |
| Jueta | Ivetta | Abt. 1094 | Yorkshire, England | Abt. 1115 | Yorkshire, England | WFT Est. 1121-1188 | |
| William Kappa, Jr. | | | | October 22, 1982 | Knoxville, Tennessee | | |
| Theodoros Kastamonites | | Abt. 1099 | | WFT Est. 1118-1150 | | WFT Est. 1129-1190 | |
| Euphrosyne Kastamonitissa | | Abt. 1125 | Constantinople, Turkey | WFT Est. 1153-1154 | | Aft. 1195 | |
| Katherine | | 1550 | England | WFT Est. 1581-1608 | | 1633 | England |
| Daniel Kendrick | | | | | | | |
| Kenneth I macAlpin, King of Scotland | | | | | | 859 | Forteviot, Perthshire |
| Kenneth I of Alba, King of Scotland | | | | | | 995 | Finela's Castle, Fettercain, Scotland |
| Sigehelm of Kent, Ealdorman of Kent | | | | | | | |
| Deon Marie Ketler | | | | | | | |
| Nichole Danille Ketler | | | | | | | |
| Richard Ketler | | | | | | | |
| Eleanor Key | | Abt. 1753 | | Abt. 1770 | | Abt. 1815 | Spartanburg District, South Carolina |
| Jennifer Marie Kiel | | 1957 | | | | | |
| Kintner | | | | | | | |
| Andrew Kintner | | 1767 | Augusta County, Virginia | 1808 | Columbiana County, Ohio | Abt. 1815 | Columbiana County, Ohio |
| Elizabeth Kintner | Kintas, Elizabeth | July 3, 1808 | | June 24, 1830 | | April 23, 1855 | |
| George Kintner | | Abt. 1745 | Germany | Abt. 1764 | Washington County, Pennsylvania | 1809 | Washington County, Pennsylvania |
| Donna Jean Knowles | | | | December 27, 1991 | Pittsburgh, Pennsylvania | | |
| Theodora Komnene | | Abt. 1095 | Constantinople, Turkey | Abt. 1120 | Constantinople, Turkey | WFT Est. 1125-1189 | |
| Emperor of the Angelos Konstantinos | | Abt. 1085 | Constantinople, Turkey | Abt. 1120 | Constantinople, Turkey | Aft. 1166 | |
| Joyce Kuchinsky | | February 3, 1947 | Worcester, Massachusetts | September 25, 1982 | New Haven, Connecticut | | |
| Kunigunda | Cunegonde | 813 | | | | | |
| Kunigunde of Swabia | | | | | | | |
| Alan La Zouche | | Abt. 1157 | Northamptonshire, England | Abt. 1181 | Josselin, Morbihan, France | 1190 | |
| Alan La Zouche | | Abt. 1203 | Leicestershire, England | Bef. 1242 | Hampshire, England | August 10, 1270 | England |
| Margeret La Zouche | La Zouche, Margery, Mary La Zouche | Abt. 1251 | Clavering, Essex, England | 1265 | | WFT Est. 1269-1345 | |
| Roger La Zouche | | Abt. 1182 | Ashby, Leicestershire England | Abt. 1204 | | Bef. May 14, 1238 | |
| Joseph Lacy | | | Lynchburg, Virginia | December 31, 1829 | Tuscaloosa, Alabama | | |
| Jean Kilroy Lahey | | | Montgomery, Alabama | August 17, 1918 | | 1936 | |
| Johann Burchard Lahm | | | | | | | |
| Johann Peter Lahm | | 1691 | Germany | | | 1756 | Germany |
| Johann Conrad Lamb | | February 2, 1720/21 | Kleinich, Germany | Abt. 1740 | | Abt. 1776 | Virginia or Pennsylvania? |
| Maria Susannah Lamb | | Abt. 1745 | Germany | Abt. 1764 | Washington County, Pennsylvania | Abt. 1828 | Ohio |
| Bathsheba Lane | | | | | | | |
| LeRoy Langdon | | | | | | | |
| Bertrada II of Laon | | | | 740 | | July 12, 783 | |
| Melissa L. Larrabee | | | New York | April 18, 1852 | | | |
| Angelo William Le Donne | | August 5, 1931 | | November 14, 1959 | Hartford, Connecticut | | |