"one who grinds grain in a mill," mid-14c. (as a surname by early 14c.), agent noun from mill (v.1). In Middle English both with and without the -n-. The Old English word was mylnweard, literally "mill-keeper" (preserved in surname Millward, which is attested from late 13c.).
"fisher with a hook and line," mid-15c. (c. 1300 as a surname); agent noun from angle (v.1).
"one who pastures cattle for market," late 13c. as a surname, agent noun from graze (v.1).
1904, in reference to the ideas or followers of German philosopher Friedrich Nietzsche (1844-1900). The surname is probably a diminutive of Nikolaus.