Where does “Ἀγάπιος” come from?

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

Ancestry of “Ἀγάπιος”, step by step

StepLanguageWordMeaning
1Ancient Greek-ῐοςbelonging to; of”, “belonging to”, “pertaining to
2Proto-Indo-European-yósCreates adjectives from noun or verb stems
Every word from Proto-Indo-European -yós →Every word from Ancient Greek -ῐος →