In the French origin, Marcellus means "God of war"
In the Latin origin, Marcellus means "Marcellus \mar-cellus, marce(l)-lus\ as a boy's name is pronounced mar-SEL-us. It is of Latin origin. A diminutive form of Marcus. The name of numerous saints.
Marcellus has 1 variant form: Marcello.
For more information, see also related names Marcel, Mark and Marlon.
Baby names that sound like Marcellus are Marcell and Marcellin.
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In the Literary origin, Marcellus means "Appeared in Hamlet"