Last name Trefor (Trefor 
) , globally, is a very rare surname. The surname Trefor is characteristic of Spain, where it is a very rare surname, the United Kingdom, and the United States, where it is an extremely rare surname. More prevalently, Trefor is the forename as well as the last name.
| dafydd trefor Welsh cleric and poet (b. 1501) |
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| john trefor British television director (b. 1901) |
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| siôn trefor Welsh poet |
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| dafydd trefor |
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| llywarch gam ap lluddocca ap tudur trefor |
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| ednyfed gam ap llywarch gam ap lluddocca ao tudur trefor |
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Puw, Thomas, Thorpe, Harris, Hughes, Farrow, Watson, Symonds, Roberts, Douglas, Jenkins, Edwards, Hopkins, Vaughan, Wickens, Woodham, Stambuck, Rowlands, Williams, Middleton, Prytherch, Griffiths, Levins, Davies, Powell, Beynon, Tea, Hay, Moss, Alun, Cole, Cook, Parr, Tebb, Owen, Smith, Llewellyn, Parry, Lloyd, James, Jones, Ellis, Evans, Owens, Morris, Morgan, Mundth, Coster, Lewis, and Naunton Evans