Surname Gwion (Gwion 
) , throughout the world, is a very rare last name. The cognomen Gwion is characteristic of Northern America, particularly the United States, where it is an extremely rare surname. More prevalently, Gwion is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Gwion | New Zealand, United Kingdom, United States |
| efa ferch bleddyn fychan ap bleddyn ab y gwion |
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| gwion fychan ap gwion |
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| angharad ferch thomas ap gwion |
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| dafydd ab ieuan fychan ab ieuan ap gwion |
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| hywel ab einion ab ieuan ap gwion |
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Sims, Samson, Ashton, Davies, Dafydd, Gwilym, Larsen, Thomas, Thorpe, Hallam, Hoyles, Hughes, French, Prydderch, Roberts, Trefgarne, Harding, Vincent, Brearley, Phillips, Rowlands, Llewelyn, Morgan, Healy, Evans, Emlyn, Cain, Crow, Bach, Rees, Glyn, Llyr, Eryl, Emyr, Iwan, Owen, Williams, Scott, Parri, Parry, Lewis, Lopez, Llwyd, Jacob, James, Jones, Tomos, Tegid, Smith, and Griffiths