Where does “Bezuch” come from?

Bezuch (Polish) comes from Polish bez, from Proto-Slavic bez, from Proto-Indo-European *bʰeǵʰs.

Ancestry of “Bezuch”, step by step

Step	Language	Word	Meaning
1	Polish	bez	without, lacking; elder; lilac
2	Proto-Slavic	bez	without
3	Proto-Indo-European	*bʰeǵʰs	—