Marcelin is a French given name of Latin origin, derived from the Roman family name Marcellinus, which was itself derived from the praenomen Marcellus. The name means "dedicated to Mars," the Roman god of war. It is composed of the elements marcel-, meaning " dedicated to," and -lin, a diminutive suffix. Marcelin has been used in France since the Middle Ages but remains relatively rare compared to other names such as Marcel or Marcellin. The name was particularly popular among the French nobility during the Renaissance period. Notable individuals with this name include Marcelin Berthelot, a French chemist and politician, and Marcelin Aubert, a Canadian politician.
Marcelin is quite rare; only 5 babies were named Marcelin annually in 1982.