Last name Macdiarmid (Macdiarmid 
, Макдиармид 
) , throughout the world, is quite a rare surname. The last name Macdiarmid is habitual in New Zealand, where it is quite a rare surname, Canada, where it is a rare surname, and the United Kingdom. Not in comparison with a country's population, it most frequently occurs in the United Kingdom, the United States, and Canada.
| VARIANT | COUNTRY |
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| Macdiarmid | Canada, Australia, United States, United Kingdom, Kenya |
| Макдиармид | Kyrgyzstan |
| john macdiarmid Scottish journalist and author (b. 1779) |
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hugh macdiarmid Scottish poet, pen name of Christopher Murray Grieve (1892-1978), GB (b. 1892) |
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douglas macdiarmid New Zealand painter (1922-2020), NZ (b. 1922) |
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| william macdiarmid Canadian politician (1875-1947), CA (b. 1875) |
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| john macdiarmid (b. 1865) |
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alan graham macdiarmid New Zealand chemist (1927-2007), NZ (b. 1927) |
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| allan macdiarmid Macdiarmid, Sir Allan Campbell (1880–1945), steel manufacturer (b. 1880) |
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| donald neil macdiarmid New Zealand Presbyterian minister, AU (b. 1886) |
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| gordon macdiarmid New Zealand general medical practitioner and surgeon (1888-1980), NZ (b. 1888) |
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margaret macdiarmid Canadian politician, CA |
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| maunagh macdiarmid (1947-1974) (b. 1947) |
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| fiona macdiarmid (born 1949) (b. 1949) |
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| glenda macdiarmid (born 1954) (b. 1954) |
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| rory peter alistair macdiarmid (born 1956) (b. 1956) |
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| jane macdiarmid Canadian teacher, CA |
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