Derived from Middle Dutch mast "(ship's) mast; pole", a nickname for a tall, lanky man. Alternatively, it can derive from the homonym mast "pig fodder, animal fodder".
Derived from Middle High German and Middle Dutch mast "mast (fodder made of acorns and beechnuts); the process of fattening livestock", an occupational name for a pig farmer or a swineherd. In some cases, however, the German name may also have been derived from Middle High German mast, mastic "fat, stout".