Last I heard, were- in English were-wolf is a native Germanic word, and almost certainly not from Latin. E.G. Wikipedia cites: “ From Middle English wer, were, from Old English wer (“man”), from Proto-West Germanic *wer, from Proto-Germanic *weraz, from Proto-Indo-European *wiHrós (“man, freeman”).” The Latin option isn’t impossible, but the root is just ubiquitous across the Germanic languages.