Where does “papa” come from?

papa (French) comes from Middle French papa, from Old French papa, from Latin papa, from Ancient Greek παπᾶς, from Old Norse súla, from Proto-Germanic sūliz, from Proto-Indo-European ḱsewl-, from Proto-Indo-European ḱsew- — to scrape, shave, sharpen.

papa (French): papa, a child's father; also as form of address:...