- DWNN, JAMES (c. 1570 - c. 1660), prydydd
- DWNN, LEWYS (c. 1550 - c. 1616)
- DWNN, OWAIN (c. 1400 - c. 1460)
- DYER, JOHN (1699 - 1757), bardd
- DYFED - gweler REES, EVAN
- DYFNALLT - gweler OWEN, JOHN DYFNALLT
- DYFRIG - gweler DAVIES, EVAN THOMAS
- DYFRIG (fl. 475?), sant Cymreig cynnar
- DYKINS, WILLIAM (Dirwynydd; 1831 - 1872), llenor a bardd gwlad
- DYN DALL, Y - gweler DAVIES, DANIEL
- DYNEVOR, 7fed Barwn - gweler RHYS, WALTER FITZURYAN
- DYNEVOR, 8fed Barwn - gweler RHYS, WALTER FITZURYAN