biz (Middle High German) comes from Middle High German bī, from Old High German bī, from Proto-West Germanic bī, from Proto-Germanic bi, from Proto-Indo-European h₂m̥bʰi, from Proto-Indo-European h₂n̥tbʰi, from Proto-Indo-European h₂énts, from Proto-Indo-European h₂ent- — on, onto.
Ancestry of “biz”, step by step
biz traces back through 3 separate lines of ancestry.