Where does “ራስ ተፈሪ” come from?

ራስ ተፈሪ (Amharic) comes from Amharic ራስ, from Proto-Semitic raʾš- — head.

Ancestry of “ራስ ተፈሪ”, step by step

Step	Language	Word	Meaning
1	Amharic	ራስ	head
2	Proto-Semitic	raʾš-	head