Yes, it is very plausible. Keep in mind that Old Testament Hebrew was written with no vowels. The vowels are basically just guessed at. And "sh" and "s" are the same letter in Semitic languages. The "in" at the end of the name was probably taken as a plural, which would be written "im" in Hebrew.
So "Nabu-sharrussu-ukin" could easily become "Nebo-Sarsekim" when transliterated into Hebrew.
Ok, but I remember when that “Tomb of Jesus” guy was being bashed over less variation than this.
Or mumbled rapidly.