Iudocus

Iudocus is a Latinized form of the Medieval Breton name Judoc, itself derived from an Old Breton element meaning lord or prince. It was borne by a seventh-century Breton saint, the son of a Cornish king, whose cult spread widely through Brittany, Cornwall, and parts of continental Europe. The name appears in English as Joyce, which was originally a masculine name before shifting to predominantly feminine use, and the French form Josse also descends from the same source.