Where does “Άκης” come from?

Άκης (Greek) comes from Greek -άκης, from Byzantine Greek -άκης.

Ancestry of “Άκης”, step by step

Step	Language	Word	Meaning
1	Greek	-άκης	Gives a diminutive form of a masculine first...
2	Byzantine Greek	-άκης	—

Άκης — Etymology, Origin & Word History | Etymology Explorer