I always thought Eigenvektor was borrowed from German, not Dutch?

https://en.wikipedia.org/wiki/Eigenvalues_and_eigenvectors#H... seems to confirm the German origins, citing David Hilbert and Hermann von Helmholtz as originators of the word.

You mean "sajátvektor"? (Hungarian)

https://hu.wikipedia.org/wiki/Saj%C3%A1tvektor_%C3%A9s_saj%C...

Now consider the SI units. Could those be some of the most common words between all languages?

In french, it is "vecteur propre" (which has the same meaning).