Family name Watt (Watt 
, 瓦特 
, وات 
, along with others...) , globally, is a common cognomen. The cognomen Watt is characteristic of Jamaica, where it is quite a common surname, Australia, and New Zealand (explore the name in all countries). Not in comparison with a country's population, the name is most common in the United States, the United Kingdom, and Australia. Very seldom, Watt is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Watt | Australia, Canada, Senegal, United Kingdom, United States |
| 瓦特 | China |
| وات | Iraq |
| Уотт, Уатт | Russia |
| Ватт | Russia, Ukraine |
| ואט | Israel |
| watt of sussex King of Sussex (b. 700) |
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| paul von watt cleric and academic, DE (b. 1450) |
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| peter von watt (1451-1505) (b. 1451) |
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| hektor von watt CH (b. 1450) |
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| thomas watt (1642-1734) (b. 1642) |
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| james watt Peerage person ID=705421 (b. 1660) |
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james watt British engineer (1736–1819), GB (b. 1736) |
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| james watt Scottish merchant (b. 1698) |
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| james watt (1705-1761) (b. 1705) |
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| mary watt (1707-1763) (b. 1707) |
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robert watt Scottish physician and bibliographer (b. 1774) |
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| margaret watt (born 1748) (b. 1748) |
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| james watt (1750-1826) (b. 1750) |
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george d. watt English Mormon editor and missionary, GB (b. 1812) |
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william hogg watt New Zealand politician, NZ (b. 1818) |
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