Marcus \m(a)-rcus, mar-cus\ as a boy's name is pronounced MAR-kus. It is of Latin origin, and the meaning of Marcus is "dedicated to Mars". The root of names such as Mark and Marcel. Mythology: Mars, the Roman god of fertility, for whom the spring calendar month March was named, became identified with the Greek Ares, god of war. The name was possibly influenced by a hit TV series "Marcus Welby, M.D." and civil rights activist Marcus Garvey. Markos and Markus are Dutch, German, and Hungarian forms. Marcas is Irish and Scottish. See also Marcellus and Marquis. Retailer Stanley Marcus; hockey player Markus Naslund.
For more information, see also the related name DeMarcus.