Family name Leathem (Leathem 
) , throughout the world, is quite a rare surname. The surname Leathem is habitual in Ireland, where it is quite a rare surname, New Zealand, and the United Kingdom, where it is a rare surname. Measured by absolute frequency, this name is the most popular in the United Kingdom, the United States, and Australia. Much less frequently, Leathem is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Leathem | United Kingdom, United States, Ireland, Australia, Canada |
| william j. leathem 1815-before 1862 Nationality: British, GB (b. 1815) |
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| robert rendle louis leathem (1869-1935) (b. 1869) |
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| william harvey leathem Northern Ireland army chaplain and Presbyterian minister, GB (b. 1875) |
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| john gaston leathem GB (b. 1871) |
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janet leathem researcher, NZ |
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| peter leathem (b. 1965) |
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| andrew leathem English rugby league player, GB (b. 1977) |
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| audrey leathem Peerage person ID=634290 |
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| john gaston leathem Peerage person ID=634243 |
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