Cadwallader

Brythonic in origin, the name of Cadwallader came from the rugged landscape of Wales. The name is from the Welsh personal name Cadwaladyr. In Old Welsh, this name was Catguallon. Both Cornish and Breton, which along with Welsh, make up the family of Brythonic Celtic languages have cognate forms of this name; the Cornish form is Caduualant, and the Old Breton form is Catuualon.