Transferred use of the surname, originally a local name for someone who lived in a dale or valley. It is now fairly commonly used as a given name, along with other monosyllabic surnames of topographical origin (see for example Dell and Hale).
French: 1. (Maçon): occupational name for a mason, French maçon. 2. habitational name from places so called in Saône-et-Loire, Allier, Aube, the Côte d'Or, Gers, and Deux-Sères. 3. from the old oblique form of a Germanic personal name Mako, from Mago, a short form of a compound name formed with maht ‘strength’, ‘power’ as the first element.