The entire staff of the local posh food store greets me by name (first and last) although I have been there merely half a dozen times.
I suspect they are being "friendly." I find the experience "alarming."
This is partly cultural: customer service in England is sparse, to say the least, and in Cambridge you could describe shop clerks as antagonistic. The folks at Bacchanalia and the farm store were the only amiable people I encountered on a daily basis, but they certainly never knew my name. Or at least, they didn't use it.