For place-names, exchanges of territories during worldgen make me want that to be far more complicated. "-ton" and "-ville" and "-borough/-burgh" and "-by" and all kinds of
other suffixes got used by various different cultures to dominate various parts of British territory, at various times (and I know the same applies to everywhere else in the world, possibly with the exception of Antartica
), and sometimes it's a brand-new name, but often it's either a corruption or addition to the name the incomers picked up from the remnants of the old natives, or perhaps the peskily still-resisting ones that they were still 'taking over from' (militarily or culturally).
By "addition", I'm talking of the like of Pendle Hill. "Pen" being "hill". As is "Dol", more or less, which made the local name of "Pendle" mean "hill hill". But
again the reference to the hill is forgotten/ignored And so "Pendle Hill" is "hill hill hill". And of course "Torpenhow Hill" is more famous as being "hill hill hill hill", but there's doubt about this...
But, certainly, any "River Avon" is actually "River River". Or similar. And in fact
most rivers, at least here in the UK are "River River", or "River Water" in some manner, and I know that "the Mississippi River" is "big river river". (Another colonial repetition is "The La Brea Tar Pits" which, IIRC, if you make the Spanish bits English means "The the tar tar pits.")
For a change by corruption, there are many examples I could give you. But the one I
always like explaining is Barmouth, a locale on the coast of Wales. The Welsh name is Abermaw. "Aber=>Bar, Maw=>Mouth", right? Well, no. "Aber-" is "The mouth of-" bit, and it is the "River(/Avon) Mawddach"[1] that is flowing out, not any river by the name of anything like "Bar". (I'll let you investigate for yourself the various possible origins of the name "Mawddach"... But I'd also consider looking up system of mutations that Welsh uses, for even more fun...
)
[1] Pron. "Mautha(hk)", roughly. With a hard 'th' and a similar ending to the Scottish 'loch' that I can never explain in text only to anyone not already familiar with it, but I'm giving it another go anyway!