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In all the world, Firmin (Firmin , Firminus , 费明 ) is a common predominantly boy's, but very seldom girly first name. The first name Firmin is habitual in Cameroon, where it is quite a common boy's name, the Democratic Republic of the Congo, where it is quite a rare primarily masculine, but scarcely feminine name, and Belgium, where it is quite a rare male name. In absolute terms, it most frequently occurs in Sub-Saharan Africa, particularly the Democratic Republic of the Congo, Cameroon, and Ethiopia. Very seldom, Firmin is the last name as well as the forename.
Firmin is also a name for the fictitious and mythical characters: Fermin , the Spanish saint and Firmin Van de Kasseien , character in De Kiekeboes.