Macy \m(a)-cy\ as a boy's name (also used as girl's name Macy), is of Old French origin, and the meaning of Macy is "weapon". Also possibly place name: "Matthew's estate" or (Gaelic) "long, low hill", or derived from Mace. Department store founder R.H. Macy; actor William Macy.
Macy has 1 variant form: Macey.