"of or pertaining to Lake Mareotis" in Lower Egypt, from Latin Mareoticus, from Greek Mareōtikos, from Mareōtis (limne), from Egyptian Mer, Mir, name of a city on the lake.
Marcionite
Marcomanni
Marcus
Mardi Gras
mare
Mareotic
Margaret
margaric
margarin
margarine
Margarita