From Middle English Coloyne, from Old French Cologne, from Latin Colōnia Agrippīna (“Agrippine Colony”), a settlement named after Agrippina, the mother of Roman Emperor Nero; colōnia (“colony”) comes from colōnus (“farmer; colonist”), from verb colo, colere (“till, cultivate, worship”). Doublet of Colonia, colony, and Köln, from German.