There are but, and I know this is heresy to some, I'd rather have something bespoke to each setting.
I'm going to publish an adventure* with a halfling town alongside an analogue of the Mississippi River. The NPCs who populate that should feel different, IMO, than the ones I might run into in, say, the Gloaming.
I also created a whole new random table of names for this halfling community, so this is something I'm big into generally. These halflings are river halflings, and not generic ones from the core book.
* Well, finish, polish and republish a half-finished one I did for a jam that I ran out of time on.