Cognomen Macwilliam (Macwilliam 
) , in the entire world, is a rare surname. The last name Macwilliam is habitual in Isle of Man, where it is quite a rare surname, Papua New Guinea, and Canada, where it is a rare surname. Measured by absolute frequency, it is the most numerous in Canada, the United Kingdom, and the United States. Much less frequently, Macwilliam is the forename as well as the last name.
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| Macwilliam | United Kingdom, United States, Papua New Guinea, Argentina, Canada |
| donald macwilliam Claimant to the Scottish throne (b. 1150) |
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| gilleasbuig macwilliam (b. 1150) |
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| domnall ban macwilliam (b. 1150) |
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| henry macwilliam mp politician (b. 1532) |
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john alexander macwilliam Scottish physiologist, GB (b. 1857) |
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| alexander macwilliam, sr. American politician in Florida (1891-1966), US (b. 1891) |
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| charles macwilliam wrestler, US (b. 1903) |
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| gordon macwilliam Dean of St David's (b. 1923) |
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andrew macwilliam Canadian ice hockey player (1990-), CA (b. 1990) |
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| john macwilliam British Roman Catholic bishop, GB (b. 1948) |
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| lyle macwilliam Canadian Member of Parliament, CA (b. 1949) |
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| mike macwilliam Canadian ice hockey player, CA (b. 1967) |
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| susan macwilliam GB (b. 1969) |
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| david macwilliam Canadian painter |
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| godfrey macwilliam Peerage person ID=107722 |
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