I always always associate Emma with the same-named Jane Austen book and with the “Tante-Emma-Laden”. Latter is a German name for general store, transalted: Aunt Emma Shop. It has all sorts of things, sometimes old stuff that nobody really wants anymore (sort of like antiquities, but not that valuable).
I’ve also never met anyone named Emma or at least can’t remember right now. There are loads of books and films with a heroine named Emma, though. Never understood why …