Cognomen Crichton (Crichton 
, Крайтон 
, קרייטון 
) , all over the world, is quite a common surname. The cognomen Crichton is characteristic of Saint Vincent and the Grenadines, where it is quite a common surname, Belize, and New Zealand, where it is quite a rare surname. In absolute terms, it is commonest in the United Kingdom, the United States, and Australia. Much less frequently, Crichton is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Crichton | Australia, United Kingdom, United States, South Africa, Canada |
| Крайтон | Ukraine, Belarus, Russia |
| קרייטון | Israel |
| george crichton, 1st earl of caithness Scottish admiral (b. 1409) |
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| margaret crichton (1498-1540) (b. 1498) |
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| robert crichton 16th-century Scottish Catholic cleric, GB (b. 1500) |
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james crichton Scottish polymath, GB (b. 1560) |
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| john crichton c. 1528 - c. 26 July 1549 (b. 1528) |
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| robert crichton Scottish advocate (1530-1582) (b. 1530) |
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| william crichton Scottish Jesuit (b. 1535) |
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| robert crichton, 8th lord crichton of sanquhar Scottish peer executed for murder (b. 1568) |
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| robert crichton Scottish knight (c.1569–c.1620) (b. 1569) |
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| william crichton Scottish noble (b. 1598) |
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| william crichton Scottish minister of the Church of Scotland, 1630-1708 (b. 1630) |
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| janet crichton (born 1640) (b. 1640) |
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| robert crichton, lord crichton (born 1641) (b. 1641) |
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| george crichton (1664-1748) (b. 1664) |
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| penelope crichton, countess of dumfries (1682-1741) (b. 1682) |
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