• Quelle www.pbenyon.plus.com/Misc/Etymology.html: Mark, a boundary; e.g. Marbury, Merkbury, March. Marchmont

• teanglann.ie: 1. (a) Target, goal. ~ a chur suas, to set up a target; to mark a finishing point (to race, etc.).
  Pronunciation, Foghraíocht listen/hören, lusen