Maximilian \max(i)-mi-lian\ as a boy's name is of Latin origin, and the meaning of Maximilian is "greatest". The name of three Roman emperors and various saints. The name is popular in Germany. Actor Maximilian Schell.
Maximilian has 26 variant forms: Mac, Mack, Maks, Maksim, Maksym, Maksymilian, Massimiliano, Massimo, Max, Maxey, Maxemilian, Maxemilion, Maxie, Maxim, Maxime, Maximilian, Maximiliano, Maximilianus, Maximilien, Maximillian, Maximino, Maximo, Maximos, Maxy, Maxymilian and Maxymillian.