Surname Gwilliam (Gwilliam 
) , globally, is quite a rare last name. The surname Gwilliam is habitual in the United Kingdom, where it is quite a rare surname, New Zealand, and Slovenia. In absolute terms, this name is the most popular in the United Kingdom, the United States, and Canada. Very seldom, Gwilliam is the forename as well as the last name.
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| Gwilliam | United Kingdom, Canada, Australia, New Zealand, United States |
| george gwilliam biblical scholar (b. 1846) |
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| george henry gwilliam (b. 1846) |
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| edward gwilliam (1877-1954), GB (b. 1877) |
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| freda gwilliam Gwilliam, Freda Howitt (1907–1987), educationist (b. 1907) |
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| luke gwilliam (American) (b. 1911) |
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| john gwilliam Welsh rugby union player, GB (b. 1923) |
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| des gwilliam boxer who competed for England, GB (b. 1954) |
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| brad gwilliam Australian footballer (b. 1966) |
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| tom gwilliam college basketball player (1962–1962) Idaho |
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| owen gwilliam Ph.D. Northwestern University 2012 |
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| jamie gwilliam researcher |
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| russell gwilliam researcher ORCID ID = 0000-0002-1488-755X |
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| ryan gwilliam researcher |
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| c. gwilliam researcher ORCID ID = 0000-0002-9401-5304 |
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| rhian gwilliam researcher |
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