What does the latin word Evanir means?

Answer 1

It is most likely a form of "evanesco" (-vanescere, -vanui), which means "to vanish, disappear, pass away," or "evanidus" (-a, -um), which means "vanishing, passing away."

Answer 2

It appears to be derived from exvanire, a Vulgar Latin word

Main Entry: van·ish

Etymology: Middle English vanisshen, from Middle French evaniss-, stem of evanir, from (assumed) Vulgar Latin exvanire, alteration of Latin evanescere to dissipate like vapor, vanish, from e- + vanescere to vanish, from vanus empty