mop (n.)
late 15c., mappe "bundle of yarn, etc., fastened to the end of a stick for cleaning or spreading pitch on a ship's decks," from Walloon (French) mappe "napkin," from Latin mappa "napkin" (see map (n.)). Modern spelling by 1660s. Of hair, from 1847.
mop (v.)
1709, from mop (n.). Related: Mopped; mopping.