Surname Rhydderch (Rhydderch 
) , around the world, is a rare cognomen. The last name Rhydderch is characteristic of the United Kingdom, where it is a rare surname, Australia, and Canada, where it is a very rare surname. Measured by absolute frequency, it is the most numerous in the United Kingdom, Australia, and the United States.
| rhydderch ap iestyn King of Gwent and Morgannwg, GB (b. 950) |
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| rhydderch ab ieuan llwyd literary patron and jurist (b. 1325) |
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| john rhydderch Welsh printer and poet, GB (b. 1673) |
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francesca rhydderch Welsh author and academic, GB (b. 1969) |
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| samantha wynne rhydderch British poet, GB (b. 1966) |
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| caradog ap rhydderch Welsh prince, GB |
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| gruffydd ap rhydderch King of Kingdom of Gwent, GB |
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| rhys ap rhydderch Welsh king, GB |
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| margaret rhydderch Peerage person ID=610260 |
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| john ap rhydderch Peerage person ID=610259 |
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| rhydderch gwynne - Aft 1613 |
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| rhydderch ap rhys ap hywel of tregayan - Aft 1525 |
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| cydifor fawr ap gollwyn ap gwyn ap rhydderch - 1091 |
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| rhydderch ap rhys ap philip ap dafydd |
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| james ap rhydderch, of laugharne |
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Mr, Polly, David, Donna, Gerry, Gemma, Lorna, James, Elwyn, Martin, Becky, Melody, Sheila, Angela, Pertye, Lauren, Jacque, Michael, Suzanne, Barbara, Rebecca, Samuel, Clare, Allie, Suzie, Ms, Sam, Dan, Tom, Ian, Sian, Alex, Alun, Ruth, Ryan, Dean, Dave, Gwyn, Jack, Josh, John, Nick, Elin, Sally, Sarah, Simon, Richard, and Grioghar