Where does “Φαρισαῖος” come from?

Φαρισαῖος (Koine Greek) comes from Aramaic פְּרִישַׁיָּא, from Aramaic פְּרִישׁ — separatist; separated.

Φαρισαῖος (Koine Greek): Pharisee, a member of an ancient religious sect...