Yes, there must have been some people who travelled, trading or whatever, even when most stayed where they lived, so rivers would have had to be distinguished somehow.

I tend to look for Georgette Heyer characters! Because she picked her names from maps, they always sound authentic, and it's fun thinking, ooh, Hethersett, that's from - okay, the name of the book escapes me at the moment, but Felix Hethersett was a fine, upstanding chap.

And the other Leeds... yep, word derivations are fascinating and strange. My Beast asked me a few days ago if 'troll' and 'toll' were related, on the grounds that trolls exact a toll for passing across their bridges. I have no idea, although my instinct is to say there's no connection. But if we taught this kind of thing in school there'd be a lot more understanding of what words really mean.