Cognomen Gwalchmai (Gwalchmai 
) , in the world, is a very rare last name. The cognomen Gwalchmai is habitual in the United Kingdom, where it is a very rare surname, Canada, and the United States, where it is an extremely rare surname.
| gwalchmai ap meilyr Welsh poet (b. 1150) |
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| einion ap gwalchmai Welsh poet (b. 1150) |
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| meilyr ap gwalchmai Welsh poet (b. 1150) |
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| gwalchmai ap dafydd Welsh harpist |
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| ben gwalchmai Welsh writer and politician, GB (b. 1985) |
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| gwalchmai ap meilir of trefeilir, lord of malltraeth |
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Mr, James, Joyce, Nancy, Meghan, Sioned, Alison, Amanda, Bethan, Denley, Louise, Joseph, Joshua, Jeremy, Nicola, Angelia, Katlynn, Richard, Lorna, Diana, David, Karen, Ms, Mark, Bill, Paul, Rick, Gary, Gill, Lisa, Jourdan, Lori, Jean, Jeff, Judy, Molly, Moira, Chris, Cathy, Barry, Luke, and Stephanie