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Worldwide, Janusz (Janusz , Януш , יאנוש ) is a common boy's given name. The given name Janusz is habitual in Poland, where it is a common masculine name, Germany, where it is quite a rare boy's name, and Ireland. In absolute terms, it most frequently occurs in Poland, Germany, and the United States. More prevalently, Janusz is the last name as well as the forename.
Janusz is also a name for the fictitious and mythical characters: Janusz Tracz , character in Plebania; Janusz Dreyfus , character in Spadkobiercy; Janusz Odrowaz , the operatic character in the opera Halka; Janusz Wojnarowski and János Boka , character in The Paul Street Boys.