Interesting, I never connected "viteaz" with viking. "Vitez" is a word that in many Slavic languages means "knight". In Hungarian it's "Vitéz".

A short trip down wikipedia and wiktionary leads me to Proto Slavic word vitędzь https://en.wiktionary.org/wiki/Reconstruction:Proto-Slavic/v...

And indeed, there it is: > Based on the ethnonym Proto-Germanic *wīkingaz (whence Old Norse víkingr (“bay's dweller”)).

I was a bit skeptical about your claim, but you were indeed right. Thanks for the little history and etymology lesson.