Where does “ógánach” come from?

ógánach (Irish) comes from Middle Irish ógán, from Old Irish ócán, from Old Irish óc, from Proto-Celtic *yuwankos, from Proto-Indo-European h₂yuh₁n̥ḱós, from Proto-Indo-European h₂yuh₁en-, from Proto-Indo-European h₂ey- — vital force, life, age, eternity; day, morning.

ógánach (Irish): adolescent, youngster, youth, young man; crafty...

Definitions

adolescent, youngster, youth, young man; crafty...

Ancestry of “ógánach”, step by step

Step	Language	Word	Meaning
1	Middle Irish	ógán	youth, young man
2	Old Irish	ócán	—
3	Old Irish	óc	young; young man; warrior
4	Proto-Celtic	*yuwankos	young
5	Proto-Indo-European	h₂yuh₁n̥ḱós	—
6	Proto-Indo-European	h₂yuh₁en-	young
7	Proto-Indo-European	h₂ey-	vital force, life, age, eternity; day, morning

Every word from Proto-Indo-European h₂ey- →Every word from Proto-Indo-European h₂yuh₁en- →Every word from Proto-Indo-European h₂yuh₁n̥ḱós →