Cognomen Llywelyn (Llewellyn 
, Llewelyn , Llywelyn 
) , all over the world, is a common surname. The family name Llywelyn is characteristic of Latin America and the Caribbean, particularly Saint Vincent and the Grenadines, where it is quite a common surname, British Virgin Islands, and Jamaica (explore the name in all countries). Measured by absolute frequency, it most frequently occurs in the United States, the United Kingdom, and Australia. Likewise, Llywelyn is the forename as well as the last name.
| gruffydd ap llywelyn Welsh monarch, GB (b. 1000) |
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| llywarch ap llywelyn Welsh poet, GB (b. 1150) |
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dafydd ap llywelyn 13th-century Welsh monarch, GB (b. 1215) |
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| susanna ferch llywelyn Peerage person ID=466369 (b. 1216) |
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| elen ferch llywelyn Welsh royalty (b. 1218) |
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| ifor ap llywelyn Welsh nobleman and patron (b. 1315) |
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| hwlkin ap llywelyn Peerage person ID=595498 (b. 1360) |
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| meurig ap llywelyn (1430-1489) (b. 1430) |
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| ieuan ap llywelyn Peerage person ID=595524 (b. 1445) |
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| wiliam dafydd llywelyn scribe of Welsh manuscripts (b. 1525) |
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carmen llywelyn American actress, US (b. 1973) |
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| dafydd llywelyn British musician (1939-2013), GB (b. 1939) |
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| dorian llywelyn Welsh author (b. 1955) |
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| robin llywelyn British writer, GB (b. 1958) |
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| dafydd llywelyn police commissioner, GB (b. 1976) |
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