| Name | aka | Birth date | Birth location | Marriage date | Marriage location | Death date | Death location |
| James Clark | | June 20, 1853 | | February 4, 1875 | | | |
| James Adams Clark | Clarke, James Adams | July 23, 1842 | Sanbornton, New Hampshire | July 31, 1865 | Holderness, New Hampshire | February 16, 1906 | Waterloo, Wisconsin |
| James Clark, Hon. | | February 1, 1784 | Sanbornton, New Hampshire | October 2, 1808 | Sanbornton, New Hampshire | June 15, 1861 | Franklin, New Hampshire |
| Joseph Clark | | | | | | | |
| Joseph Clark | | September 17, 1811 | Sanbornton, New Hampshire | January 8, 1840 | New Hampshire | July 13, 1855 | Franklin, New Hampshire |
| Kendall Peabody Clark | | December 6, 1820 | | | | | |
| Louisa Jane Clark | | April 16, 1825 | | | | May 27, 1856 | |
| Lucy Jennie Clark | | April 26, 1861 | | | | | |
| Martha Charlotte Clark | | August 7, 1870 | | | | September 10, 1877 | |
| Martha Lane Clark | | April 29, 1816 | Sanbornton, New Hampshire | September 12, 1837 | | July 15, 1862 | |
| Mary Clark | | January 19, 1855 | | | | March 29, 1856 | |
| Mary Hilton Clark | | February 23, 1818 | | September 1, 1836 | | | |
| Mary L. Clark | | 1821 | | June 1, 1840 | | April 22, 1881 | |
| Mary Lucy Clark | Clarke, Mary Lucy | December 5, 1868 | Portland, Wisconsin | December 5, 1890 | Waterloo, Wisconsin | June 19, 1929 | Madison, Wisconsin |
| Melissa Larrabee Clark | | April 12, 1857 | | | | | |
| Nellie E. Clark | | June 23, 1872 | | | | | |
| Penelope Clark | | November 11, 1935 | | | | | |
| Samuel Adams Clark | | February 15, 1810 | Sanbornton, New Hampshire | November 15, 1832 | | January 15, 1834 | Franklin, New Hampshire |
| John Clavering | | Abt. 1158 | of Clavering, Essex, England | 1178 | | WFT Est. 1184-1249 | |
| Clemence of Barcelona | | WFT Est. 1096-1135 | | WFT Est. 1130-1170 | | WFT Est. 1130-1219 | |
| Elizabeth Clerke | | 1524 | | 1535-1542 | | 1564 | |
| John Clerke | | 1500 | | WFT Est. 1519-1551 | | WFT Est. 1528-1591 | |
| Catherine Clifford | | WFT Est. 1352-1379 | | WFT Est. 1384-1411 | | WFT Est. 1384-1461 | |
| John Clifford | | Abt. 1388 | | May 1404 | | March 31, 1421 | Meaux, France |
| Matilda Clifford | Clifford, Maud | WFT Est. 1412-1434 | | Abt. 1450 | Cumberland, England | WFT Est. 1462-1534 | |
| Thomas Clifford | | February 26, 1414/15 | England | WFT Est. 1446-1454 | | May 22, 1455 | Battle of Albans, England |
| Alionore Clinton | | 1250 | | WFT Est. 1278-1312 | | WFT Est. 1278-1344 | |
| Deborah Clough | | | | September 23, 1802 | | August 28, 1867 | |
| Hannah Clough | | | | | | | |
| Moses Clough | | | | | | | |
| Clovis I, King of the Franks | Chlodovech | 463 | | | | 511 | |
| Coel Hen | | | | | | | |
| Coenwalh | | | | | | | |
| Coirpre macCormac O'D£nlainge, King of Leinster | | | | | | | |
| Bertram Dawson Coleman | | | | November 26, 1949 | Philadelphia, Pennsylvania | October 28, 1976 | |
| Carol Coleman | | August 11, 1950 | | | | | |
| Mariana Gowen Coleman | | September 4, 1955 | | | | | |
| William D. Coleman | | October 7, 1952 | | | | | |
| Colmán Már macCoirpre O'D£nlainge, King | | | | | | | |
| Conall macFáelán O'D£nlainge | | | | | | | |
| Conan I (the Crooked), Duke of Brittany | | | | | | 992 | |
| Concubine | | 1112 | Normandy, France | WFT Est. 1144-1179 | | WFT Est. 1144-1206 | |
| Mureen Conlan | | | | | | | |
| Christine Connell | | | | | | | |
| Elizabeth Byrne Connell | | March 26, 1843 | | | Collingwood, Ontario | | |
| Frances Campbell Connell | | | | | | | |
| James Connell | | | | | | | |
| James Connell | | | | | | | |
| James Connell | | 1815 | | | | 1890 | |
| Jessie Stuart Connell | | | | | | | |