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Not a German speaker, but is baden the plural form then? I feel sometimes spa towns have baden in the name and others are just "bad."
The plural would be "Bäder", but I'm not aware of any town using that plural form. It would be very strange, too, because a town is a single entity. Baden-Baden is the only one I know that comes close, and https://en.wikipedia.org/wiki/Baden-Baden#Name explains how it got that name. It's not the spa prefix, but part of the name proper. Also, "Baden" is a region in the south-western state of Baden-Württemberg that pro…
"In modern German, Baden is a noun meaning "bathing"[4] but Baden, the original name of the town, derives from an earlier plural form of Bad ("bath")"