Cognomen Gwillim (Gwillim 
) , around the world, is a rare family name. The cognomen Gwillim is characteristic of Isle of Man, where it is quite a rare surname, the United Kingdom, where it is a rare surname, and Australia. Measured by absolute frequency, it is the most numerous in the United Kingdom, the United States, and Australia.
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| Gwillim | Australia, South Africa, United States, United Kingdom, Canada |
| moore gwillim Welsh politician (b. 1501) |
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| elizabeth gwillim British painter and scientific illustrator (1763-1807), GB (b. 1763) |
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jack gwillim actor (1909-2001), GB (b. 1909) |
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| john cole gwillim CA (b. 1868) |
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| david gwillim British actor, GB (b. 1948) |
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| henry gwillim British judge, GB |
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| katherine gamand gwillim (died 1950) |
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| dwywg ap gwillim Peerage person ID=517547 |
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| evan gwillim bookseller and postmaster in Builth |
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| sarah-jane gwillim British actress, GB |
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| gwillim ap rhys Peerage person ID=517546 |
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| john gwillim (by 1493-1550 or later) of Fawley, Herefs |
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| gwillim john ap jenkin Peerage person ID=519692 |
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| james gwillim Peerage person ID=662911 |
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| gareth gwillim English professional footballer (born 1983), GB (b. 1983) |
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