Where does “κουμπάκι” come from?

κουμπάκι (Greek) comes from Greek κουμπί, from Ancient Greek κομβίον, from Ancient Greek -ῐον, from Proto-Indo-European -yós — Creates adjectives from noun or verb stems.

Ancestry of “κουμπάκι”, step by step

Step	Language	Word	Meaning
1	Greek	κουμπί	button
2	Ancient Greek	κομβίον	—
3	Ancient Greek	-ῐον	diminutive suffix; "suffix forming...
4	Proto-Indo-European	-yós	Creates adjectives from noun or verb stems

Every word from Proto-Indo-European -yós →Every word from Ancient Greek -ῐον →Every word from Ancient Greek κομβίον →