Good that comes to someone from a thing. A benefit is always to someone, and naming who is half the claim.
Old French bienfet, from Latin benefactum (a good deed), from bene (well) + facere (to do); a benefit was first an act done well for someone, before it was the good that resulted.
Names good that reaches someone specific from a thing done or built — naming who receives it is treated here as half of the claim.