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Cognomen Boleslav (Болеслав , Boleslav ) , around the world, is a rare family name. The last name Boleslav is habitual in Slovenia, where it is quite a rare surname, Czechia, and Slovakia, where it is a rare surname. Measured by absolute frequency, it most frequently occurs in Czechia, Slovenia, and Israel. More frequently, Boleslav is the forename as well as the last name.