Family name Gruffydd (Gruffydd 
) , all over the world, is a rare cognomen. The surname Gruffydd is habitual in the United Kingdom, where it is a rare surname, Ireland, and Malaysia, where it is a very rare surname. Not in comparison with a country's population, it most frequently occurs in the United Kingdom, Germany, and Ireland. Also, Gruffydd is the forename as well as the last name.
| caradog ap gruffydd Prince of Kingdom of Gwent, GB (b. 1050) |
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| gwenllian ferch gruffydd 12th-century princess consort of Deheubarth in Wales, GB (b. 1097) |
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| maredudd ap gruffydd Prince of the kingdom of Deheubarth (b. 1130) |
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llywelyn ap gruffydd Prince of Gwynedd, GB (b. 1220) |
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| anarawd ap gruffydd Prince of Deheubarth (b. 1200) |
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| dafydd ap gruffydd Prince of Wales and last independent ruler of Wales, GB (b. 1238) |
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| madog ii ap gruffydd, lord of dinas bran Welsh prince of Powys Fadog (b. 1250) |
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| owain goch ap gruffydd Welsh monarch, GB (b. 1300) |
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owain ap gruffydd Prince of Wales, GB (b. 1359) |
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| elis gruffydd Welsh chronicler, GB (b. 1490) |
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| rhys gruffydd (by 1513-80) of Penrhyn, Caern (b. 1510) |
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| robert gruffydd Welsh politician (b. 1515) |
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owen gruffydd Welsh poet, GB (b. 1643) |
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| dafydd ap gruffydd Welsh author (b. 1600) |
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| robert gruffydd musician (1753 -1820), GB (b. 1753) |
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