MORDECAI: Hebrew for "warrior." Purim is a Jewish holiday honoring Queen Ester, who saved the Persian Jews from slaughter. Boys born during this time were routinely named in honor of her cousin, Mordecai. Relatives: Mordechai, Mort, Mordy, Morty. Namesake: Mordecai Richler.
MORGAN: Gaelic for "white sea" and Welsh for "bright" or "dweller by the sea." Morgan is used interchangeably for girls and boys. Nevertheless, Morgana has long been popular as a feminine variant. Relatives: Morgen (German for "morning"), Morgana, Morganne. Namesakes: Morgan Freeman, Morgan Fairchild, Morgan le Fay, Morgana, Justin Morgan.
MORIA: Hebrew for "my teacher is God." Relatives: Moriah, Moriel, Morit, Moryah. Namesake: Mount Moriah.
MORIARTY: Irish for "sea warrior." This was the name of Sherlock Holmes's foe. Namesake: Michael Moriarty.
MORLEY: English place name for "moor" or "meadow." Relatives: Morlee, Morleigh, Morry, Morrie, Lee. Namesakes: Morley Safer, Robert Morley, Christopher Morley.
MORRIS: Related to Maurice. Relatives: Maurice, Morrie, Morry, Morse, Moss, Morrison. Namesakes: Morris West, Toni Morrison, Samuel Morse, "Morris the cat."
MORTIMER: French place name for "still water." Relatives: Morty, Mort. Namesakes: Mort Zuckerman, Mort Adler, John Mortimer, "Mortimer Snerd."
MORTON: Anglo-Saxon place name for "city on the moor." Relatives: Morten, Mortyn, Morty, Mort. Namesakes: Morton Downey, Jr., Mort Sahl, Jelly Roll Morton.
MOSELLE: From the Hebrew for "taken from water" and a feminine version of Moses. Moselle is also a wine made in the Moselle valley, which extends from eastern France into western Germany. Relatives: Mozelle, Mosheh.