Dafydd ap Llewelyn, in the Welsh language, means "David, son of Llewelyn", and there have been several notable people known by this patronymic, including
Peter Llewelyn Davies | Laurence Llewelyn-Bowen | Michael Llewelyn Davies | Jack Llewelyn Davies | Llewelyn Traherne | John Dillwyn Llewelyn | George Llewelyn Davies | Dafydd Iwan | Dafydd ap Gwilym | Sylvia Llewelyn Davies | Llywelyn ap Dafydd | Llewelyn Powys | Llewelyn Kenrick | Llewelyn Hughes | Gwladys ferch Dafydd Gam | David Pugh and Dafydd Rogers | Dafydd Williams | Dafydd Wigley | Dafydd Goch | Dafydd Gam | Dafydd Elis-Thomas | Dafydd Davis | Dafydd ab Owain Gwynedd | Dafydd ab Hugh | Dafydd ab Edmwnd |