MARLOW: Old English for "from the hillside lake." Relatives: Marlowe, Marlo. Namesakes: Christopher Marlowe, "Philip Marlowe."
MARMADUKE: Celtic for "leader on the seas." Granted it's difficult blocking the image of a Great Dane, but this is an impressive monicker. Relative: Duke. Namesake: Duke Ellington.
MARNA: From the Hebrew for "rejoice." Relatives: Marni, Marnie, Marny, Marnette, Marne. Namesake: Marne River (France).
MARSDEN: From the Old English for "field near water." Relatives: Marsdon, Marston, Marland, Marley, Marden, Marwood, Mardyth. Namesake: Bob Marley.
MARSHALL: From the English for "steward" and French for "cavalry commander." A surname that is well-suited as a first name. Relatives: Marshal, Marschall, Marsh, Marshe. Namesakes: Marshall McLuhan, Thurgood Marshall, "Marshal Dillon."
MARTHA: Aramaic for "lady" or "woman." The biblical Martha (Luke 10; John 11,12) was a bit of a drudge who complained to God about her household duties and was admonished by Him. She has since become the patron saint of housewives. Relatives: Marth, Marta, Martina, Marella, Martita, Marti, Marty, Mattie, Matty, Marthe, Masia. Namesakes: Martha Washington, Martha Graham, Martha Stewart, Martha and the Vandellas, Marthe Keller.
MARTIN: From the Latin for "of Mars." This is not to say a Martian but, rather, related to the Greek god of war -- Mars. The planet Mars rules Scorpios. Relatives: Marten, Martyn, Marton, Maarten, Martino, Martins, Marty, Martie, Mart, Mertin, Mertil, Martinson, Martel, Martinet, Martinique. Namesakes: Saint Martin, Martin Luther King, Jr., Martin Van Buren.