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Around the world, Firminus (Firmin , Firmino , Firminus ) is a common masculine first name. The forename Firminus is habitual in Sub-Saharan Africa, particularly Cabo Verde, where it is quite a common boy's name, Cameroon, and the Democratic Republic of the Congo, where it is quite a rare predominantly boy's, but very infrequently girly name. Measured by absolute frequency, it most frequently occurs in Brazil, the Democratic Republic of the Congo, and Cameroon. Likewise, Firminus is the last name as well as the forename.
Firminus is also a name for the fictitious and mythical characters: Fermin , the Spanish saint and Firmin Van de Kasseien , character in De Kiekeboes.