Weapon or pearl
Maeci is a modern creative spelling of Macy or Maisie. As a variant of Macy, it derives from an Old French surname referring to the estate of Maci in Normandy; as a diminutive of Margaret, it means 'pearl'.
Less common today
Maeci isn't in the latest US Top 1000. It last peaked at #8,949 in 2011.
US births per 5-year period, 1990βpresent (SSA data).