Where does “geac” come from?

geac (Irish) comes from Tibetan གཡག, from Proto-Sino-Tibetan g-jak ~ g-jaŋ — sheep, yak.

geac (Irish): yak

Definitions

Step	Language	Word	Meaning
1	Tibetan	གཡག	yak
2	Proto-Sino-Tibetan	g-jak ~ g-jaŋ	sheep, yak

geac — Etymology, Origin & Word History | Etymology Explorer