Cognomen Kyffin (Kyffin 
) , in all the world, is a rare surname. The cognomen Kyffin is habitual in the United Kingdom, where it is a rare surname, New Zealand, and Canada, where it is a very rare surname. Measured by absolute frequency, it is commonest in the United Kingdom, the United States, and Canada. Very seldom, Kyffin is the forename as well as the last name.
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| Kyffin | Barbados, United Kingdom, South Africa, United States, Canada |
| edward kyffin Welsh cleric, poet and translator, GB (b. 1557) |
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| elizabeth ann kyffin (born 1792) (b. 1792) |
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kyffin williams Welsh landscape painter (1918-2006), GB (b. 1918) |
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zeb kyffin British cyclist, GB (b. 1998) |
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| kyffin williams British Member of Parliament (died 1753) |
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| unknown kyffin Peerage person ID=362962 |
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| unknown kyffin Peerage person ID=281258 |
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| mary kyffin Peerage person ID=281257 |
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| john kyffin Peerage person ID=611646 |
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| ann kyffin Peerage person ID=340103 |
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| john kyffin Peerage person ID=611647 |
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| richard kyffin dean of Bangor (c.1480-1502) |
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| jane kyffin |
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| hywel ap morus kyffin |
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| geoffrey kyffin |
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Mr, Jami, Jade, John, Toni, Emma, Iwan, Owen, Marie, Miles, Jack, Sarah, Abbie, Chloe, Barry, Brian, Butch, Karen, Katie, Patty, Penny, Steve, Reece, Luke, Glyn, Ms, Jo, Amy, Ben, Roy, Jay, Tom, Huw, Ian, Lisa, Mark, Mike, Alan, Andy, Adam, Chad, Kate, Paul, Ross, Dave, Matt, and Danny