Marcello is the Italian form of Marcellus, a Roman family name that is a diminutive of Marcus and most likely goes back to Mars, the god of war, so it is often rendered "little warrior" or "young Marcus". Actor Marcello Mastroianni, the face of Italian cinema in the 1960s, remains its most famous bearer. Marcello lingered just outside the US top 1000 for years, at number 1004 in 2024, and entered the list in 2025 at number 900.