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Throughout the world, Časlav (Caslav , Časlav , Часлав ) is a rare boy's first name. The forename Časlav is habitual in Southern Europe, particularly Serbia, where it is quite a rare boy's name, and Croatia, where it is a rare male name.
Žaja, Maksimović, Živković, Jovanović, Raspopović, Stanković, Matijević, Ivanović, Petrović, Duvnjak, Dunović, Ristić, Reljić, Ivanov, Vukuša, Livada, Vasiljević, and Ignjatovič