Where does “sant” come from?

sant (Middle Welsh) comes from Proto-Brythonic *sant, from Vulgar Latin santus, from Latin sānctus, from Latin Iacobus, from Ancient Greek Ἰάκωβος, from Ancient Greek Ἰακώβ, from Hebrew יַעֲקֹב, from Hebrew עָקֵב — heel of the foot; heel.