, which is of English/Irish origin and derives from the medieval French name Josse/Iosse , from the earlier Joceus/Ioceus or Jodocus, Latinized forms of the Breton ( Celtic ) personal name "Iodac", a diminutive of "Iudh", meaning lord. Ioduc (Josse) was the name of a 7th century Breton prince, son of