Nicknames:
Max, Maxim.
Famous people named Maximilian:
Actors Max Irons and Maximilian Schell; Polish Holocaust martyr Saint Maximilian Kolbe.
Fun fact:
Jennifer Lopez and Marc Anthony chose the name Maximilian for their son.
More Inspiration:
Ax-cellent Baby Boy Names, Magnificent M Names For Baby Boys, Liam, Alex, And Beyond: Boy Names With Natural Nicknames, X-Names That Are So X-tra,
