Cognomen Dyfed (Dyfed 
) , globally, is an extremely rare surname. Predominantly, Dyfed is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Dyfed | Argentina, United Kingdom, United States |
| ifor ap gwyn ap collwyn ap llawrodd dyfed |
|
Wyn, Avalon, Brewin, Rogers, Davies, Thomas, Hughes, Wallis, Aubrey, Roberts, Edwards, Rowlands, Richards, Griffith, Williams, Pritchard, Griffiths, Llywelyn, Jones-Owen, Alston, Maycox, John, Huws, Owen, Miles, Smith, Alsop, Cynan, Morgan, Bowen, Parry, Price, Riley, Lewis, Lloyd, Jones, Evans, Brunt, and Russell-Hughes