What is the X in X-mas?
Old English wandrian "move about aimlessly, wander," from West Germanic *wandrojan (cf. Old Frisian wondria, Middle Low German, Middle Dutch wanderen, German wandern "to wander," a variant form of the root represented in Old High German wantalon "to walk, wander"), from root *wend- "to turn" (see wind (v.)). In reference to the mind, affections, etc., attested from c.1400. Related: Wandered; wandering. The Wandering Jew of Christian legend first mentioned 13c. (cf. French le juif errant, German der ewige Jude).