Where does “*beisman” come from?

*beisman (Proto-Celtic) comes from Proto-Indo-European bʰeyh₂- — to fear, be afraid; to strike, hit; to hew, cut.

Ancestry of “*beisman”, step by step

Step	Language	Word	Meaning
1	Proto-Indo-European	bʰeyh₂-	to fear, be afraid; to strike, hit; to hew, cut

*beisman — Etymology, Origin & Word History | Etymology Explorer