Last name Boguslav (Богуслав 
, Boguslav 
) , worldwide, is a rare family name. The cognomen Boguslav is characteristic of Belarus, where it is a rare surname, Ukraine, and Israel, where it is a very rare surname. In absolute terms, it is commonest in Eastern Europe, particularly Belarus, Ukraine, and Russia. Likewise, Boguslav is the forename as well as the last name.