Family name Siavach (Сиаваш , Siavach ) , throughout the world, is an extremely rare cognomen. Predominantly, Siavach is the forename as well as the last name.
Сьяваш, and Сяваш
Ab, Sarabi, and Aghababaei
, Siavach 
) , throughout the world, is an extremely rare cognomen. Predominantly, Siavach is the forename as well as the last name.