Dictionary of Medieval Names
from European Sources

Cadwallon m. Old Breton, Old Welsh cat 'battle' + Old Breton uuallon, Old Welsh uualaun, uualon 'valorous'.

The name of a 6th C king of Gwynedd, a 7th C king of Gwynedd, a 7th C king of Wessex, and a 10th C king of Gwynedd.

Wales
Latin
1206 Cadewallaunt (nom) Pryce-1st no. 9
Cite as: S.L. Uckelman. "Cadwallon". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2017, no. 1. http://dmnes.org/2017/1/name/Cadwallon.