Costain is a surname of English, Scottish and Manx origin. [1] When originating in Scotland and northern Ireland the surname is an Anglicisation of the Gaelic Mac Austain, meaning "son of Austin". The English surname is a reduced form of Constant or Constantine. [1]
Costain is a surname of English, Scottish and Manx origin. [1] When originating in Scotland and northern Ireland the surname is an Anglicisation of the Gaelic Mac Austain, meaning "son of Austin". The English surname is a reduced form of Constant or Constantine. [1]