Is this common?
Yes, I think so but more in villages.
You would have no idea whatsoever what kind of sklep it was if not for the window display - and even then it's not always obvious.
Ah they are like corner shops, they usually sell bread, milk, cheese, pickles, maybe veg.
It's the other kinds of shops that are called something else, like a hardware store is called "Z Narzedziani".
You can find the same thing in small towns in Ireland, the shop is called shop, the butchers, the butchers and so on...
Another way of looking at it, and what confuses the heck out of me, is when I go to a shopping mall (Galeria) and I look at the map of all the shops, I have no idea what they sell because they are called people's names or something abstract.
I hate shopping.