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You know what's another one from physics whose name has nothing to do with the actual meaning - "Gedanken experiment"

Huh? It literally translates to "thought experiment" in English, which is exactly what it means.

I think you may have gotten whooshed by the joke - both "eigenvector" and "gedankenexperiment" are mashups of a German word and an English word

"Gedankenexperiment" is a fully German word, though, not a mashup.