Marcello is a common masculine, Italian, given name. It's a variant of . The Spanish and Portuguese version of the name is Marcelo, differing in having only one "l", while the Greek one is Markellos.
The name originally means like a hammer. It is originally the adjectival form of Marcus, which means hammer; the -el suffix was in times of archaic Latin the adjectival form.
In music:
In other fields: