Dafydd ap Llewelyn, in the Welsh language, means "David, son of Llewelyn", and there have been several notable people known by this patronymic, including
- Dafydd ap Llywelyn (1215–1246), prince of Wales
- Dafydd Gam (1380–1415), who died at Agincourt
Dafydd ap Llewelyn, in the Welsh language, means "David, son of Llewelyn", and there have been several notable people known by this patronymic, including