Cognomen Faithfull (Faithfull 
) , across the world, is quite a rare surname. The last name Faithfull is habitual in New Zealand, where it is quite a rare surname, Australia, and Albania. In absolute terms, it is the most numerous in the United Kingdom, Australia, and Indonesia. Very seldom, Faithfull is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Faithfull | Indonesia, United Kingdom, Australia, Canada, New Zealand |
| john faithfull (1752-1824) (b. 1752) |
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| richard coventry faithfull (1753-1805) (b. 1753) |
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william pitt faithfull (1806-1896) pastoralist and politician, AU (b. 1806) |
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| charles complin faithfull (1778-1804) (b. 1778) |
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| william conrad faithfull (1782-1838) (b. 1782) |
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| william charles faithfull (1785-1810) (b. 1785) |
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emily faithfull English women's rights activist, and publisher (1835-1895), GB (b. 1835) |
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| francis joseph faithfull English cleric 1786-1854 BCL; canon of Lincoln; rector of Bishops Hatfield; chaplain to the Marquess of Salisbury (b. 1786) |
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| richard coventry faithfull (1787-1835) (b. 1787) |
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| ferdinand faithfull (1789-1871) (b. 1789) |
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| george faithfull British politician (b. 1790) |
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| louisa faithfull (1807-1907) (b. 1807) |
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| martha ann faithfull (1808-1858) (b. 1808) |
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| maria faithfull (1809-1885) (b. 1809) |
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| ann sophia faithfull (1811-1856) (b. 1811) |
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