indicate the level to which a name has been verified.
Meaning & History
Derived from Old Welsh cat "battle" and an uncertain element, possibly gwallon "ruler" or uualaun, uualon "valorous" or guallaun "good, best". (Also compare Cadwal and Cadwaladr.)Notable bearers of this name include Cadwallon Lawhir, a 6th-century king of Gwynedd; Cadwallon ap Cadfan (died 634), a 7th-century king of Gwynedd; a 7th-century king of Wessex (also known as Cædwalla); and Cadwallon ab Ieuaf, a 10th-century king of Gwynedd.