The names of the days of the week from Wednesday to Saturday in Hungarian are borrowed from a Slavic language.
I lived in Budapest twice and learned the language, but I never knew that. Of course I don’t speak any Slavic languages. I do speak German however and I noticed that Hungarian has a lot of.....what I and others call mirror image translations of phrases from German. I talked to others who also speak both languages and we noticed this. For example
English = Bra or Brazier
German = Bustenhalter (”bust holder”)
Hungarian = Meltarto (bust holder)
English = train station
German = Bahnhof (train yard)
Hungarian = Palya Udvar (train yard)
and many many more. German frequently uses combinations of short words that are descriptions of things. Hungarian does the same but you notice it frequently uses the exact same descriptions. You can see the heavy German influence....makes sense given they were part of the Hapsburg Empire for centuries.