All around the world, Gwenllian (Gwenllian 
) is a rare female first name. The given name Gwenllian is characteristic of the United Kingdom, where it is a rare female name, South Africa, where it is a very rare female name, and the United States, where it is an extremely rare feminine name. Much less frequently, Gwenllian is the last name as well as the forename.
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| Gwenllian | United Kingdom, South Africa, Belgium, United States, New Zealand |
| gwenllian ferch gruffydd 12th-century princess consort of Deheubarth in Wales, GB (b. 1097) |
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| gwenllian of wales Welsh royal Princess; daughter of Llywelyn II, GB (b. 1282) |
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gwenllian elizabeth fanny morgan Welsh antiquarian, writer and Mayor, GB (b. 1852) |
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| gwenllian pascoe morgan (1876-1925) (b. 1876) |
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| gwenllian mary cotterill Peerage person ID=447435 (b. 1884) |
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sian gwenllian Welsh politician and AM (born 1956), GB (b. 1956) |
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| gwenllian williams (born 1911) (b. 1911) |
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| gwenllian violet edwardes (1912-1987) (b. 1912) |
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| gwenllian gill British actress (1915–2004), GB (b. 1915) |
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| gwenllian ellen james (born 1929) (b. 1929) |
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gwenllian howells wife of Howell Thomas Evans, GB |
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| gwenllian anne talbot lewes (born 1934) (b. 1934) |
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| gwenllian lansdown Welsh chief executive and former councillor (born 1979), GB (b. 1979) |
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| gwenllian llywelyn (died 1843) |
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| gwenllian verch maredudd Peerage person ID=432205 |
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Wyn, Taylor, Thomas, Trewyn, Horton, Hughes, Hylton, Willis, Sanders, Anthony, Charles, Barrett, Baum-Jones, Bullock, Roberts, Dickeson, Jenkins, Edwards, Harding, Howells, Hardwick, Williams, Dafydd, Davies, Powell, Ashley, Rees, Rhys, Gray, Tawy, Huws, Hill, Owen, Scott, Small, Ching, Griffiths, Clark, Parry, Rodda, Riall, Lewis, Jones, Elias, Evans, Viant, White, Morgan, Baker, and Neethling