Where does “aion” come from?

aion (Finnish) comes from Ancient Greek αἰών, from Ancient Greek αἰϝών, from Proto-Indo-European h₂eyu-, from Proto-Indo-European h₂ey- — vital force, life, age, eternity; day, morning.

Ancestry of “aion”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	αἰών	lifetime; generation; a long period of time, eon,...
2	Ancient Greek	αἰϝών	—
3	Proto-Indo-European	h₂eyu-	vitality; eternal; vital force, life, long life,...
4	Proto-Indo-European	h₂ey-	vital force, life, age, eternity; day, morning

Every word from Proto-Indo-European h₂ey- →Every word from Proto-Indo-European h₂eyu- →Every word from Ancient Greek αἰϝών →