Cognomen Longmuir (Longmuir 
) , around the world, is quite a rare surname. The cognomen Longmuir is characteristic of Aland Islands, where it is quite a common surname, Malta, where it is quite a rare surname, and Australia. Not in comparison with a country's population, it is the most numerous in the United Kingdom, Australia, and the United States.
| VARIANT | COUNTRY |
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| Longmuir | Canada, United Kingdom, United States, New Zealand, Australia |
| john longmuir Poet and lexicographer, GB (b. 1803) |
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| alexander davidson longmuir c.1843-1891 (b. 1843) |
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| k. longmuir badminton player, GB (b. 1886) |
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| h. c. a. longmuir badminton player, GB (b. 1886) |
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| archie longmuir Scottish footballer, GB (b. 1897) |
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bill longmuir professional golfer, GB (b. 1953) |
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| james longmuir Moderator of the General Assembly of the Church of Scotland (b. 1907) |
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justin longmuir Australian footballer (b. 1981) |
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john longmuir Scottish born, Australian tenor, AU (b. 1985) |
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| alan longmuir British musician (1948-2018), GB (b. 1948) |
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| derek longmuir British musician, GB (b. 1951) |
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| troy longmuir Australian rules footballer (b. 1979) |
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| john dickson longmuir Titanic victim |
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| donald longmuir politician, US |
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| david longmuir Scottish football executive |
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