Good point! Language be weird like that.

Which is actually partially derived from who, going back to the Proto-Germanic terms equivalent to who + like. And in Middle English which was used where Modern English uses who, as in the King James version of the Lord's Prayer: "Our Father, which art in heaven..."

And what and who are derived from the same root, which is how they both wound up having the same genitive form whose, rather than having whose and something like whats.

Personally I think it'd be fine if we got to the point where who & which became interchangeable or one replaced the other, as there's fundamentally no reason to distinguish between the two. Like, I've noticed a resurgence in people using whom — often incorrectly — and quite frankly we just need to let that word die, as there's no case where its job can't be done just as well by who.

But we're far from that point, and using who as OP did will still strike the overwhelming majority of users as an error (unlike using who for whom, which only the most ardent of pedants will truly wrinkle their noses at). So it's probably best avoided, and only used when referring to people and not objects.