For Sanet: ChatGPT, which is my last resort if I can’t find anything. That claim could be completely wrong though, since I just found out this:
https://www.familysearch.org/en/surname?surname=sanetFor Lyions:
https://www.familysearch.org/en/surname?surname=LyionsFor Bolerjack:
https://www.familysearch.org/en/surname?surname=bolerjack &
https://www.familysearch.org/en/surname?surname=bolljack (See second paragraph)
For Freiwat: I don’t have a source for this surname, but I made the “vat” Old Norse conclusion because Danish surnames often draw from Old Norse elements, since Danish is a direct descendant of Old Norse. The transition from “w” to “v” is due to the historical changes in language and pronunciation. The first part, ‘frei’, I also got from ChatGPT.