Where does “πηγαίος” come from?

πηγαίος (Greek) comes from Ancient Greek πηγαῖος, from Ancient Greek -ῐος, from Proto-Indo-European -yós — Creates adjectives from noun or verb stems.

πηγαίος (Greek): οf or from a well; of or relating to source;...

Definitions

οf or from a well; of or relating to source;...

Ancestry of “πηγαίος”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	πηγαῖος	of or from a well
2	Ancient Greek	-ῐος	belonging to; of”, “belonging to”, “pertaining to
3	Proto-Indo-European	-yós	Creates adjectives from noun or verb stems

Every word from Proto-Indo-European -yós →Every word from Ancient Greek -ῐος →Every word from Ancient Greek πηγαῖος →