MacHenry \m(a)-chen-ry, mach(e)-nry\ as a boy's name is of Scottish and Gaelic origin, and the meaning of MacHenry is "son of Henry". Fort McHenry was part of the defenses of Baltimore in the War of 1812, and the inspiration for Francis Scott Key's "The Star-Spangled Banner".

MacHenry has 1 variant form: McHenry.