"masquerader, mummer, one who goes from house to house, whimsically disguised, and making diversion with songs and antics, usually at Christmas," late 15c., agent noun from guise.
Entries linking to guiser
guise n.
late 13c., "style or fashion of attire," from Old French guise "manner, fashion, way," from Frankish *wisa or some similar Germanic source, from Proto-Germanic *wison "appearance, form, manner," from *wissaz (source also of Old High German wisa "manner, wise"), from PIE root *weid- "to see." Sense of "assumed appearance" is from 1660s, from earlier meaning "mask, disguise" (c. 1500).