 In 1375 it was called "Mortzwiler", and in 1426 "Mortzwilre".In 1500, the form "Mertzwiler" appeared.The village's name, Merzweiler, has the common German placename ending "—weiler", which as a standalone word means “hamlet” (originally “homestead”), to which is prefixed a syllable "Merz—", believed to have arisen from a personal name, "Morizo", suggesting that the village arose from a homestead founded by an early Frankish settler named Morizo.