America has a lot of place names that come from Native American / First Nations languages; but they also come via different European languages.
And some of those names are actually words that refer to a different Native group. "Arkansas" and "Kansas" are from the Osage word for the Quapaw people. The name of the Snake River between Oregon and Idaho is a translation of the name that Plains people used to refer to the Shoshone: they were the "snake people" and that wasn't a compliment.
In Spanish they do rhyme and their endings are pronounced the exact same, as in Kansas. I was greatly puzzled when I discovered that the French managed to mangle the name Arkansas that badly back in the day
Brit here, I only realised a couple of years ago that the Arkansaw I heard mentioned in American TV and movies was actually the Arkansas I could see on maps. I think it was something said on Reddit, probably a thread similar to this, that was the revelation. And when I tell other Brits they're invariably similarly clueless, and quite gobsmacked. I'm not sure if anyone I've mentioned it too has said "oh yeah I knew that".