Family name Siyamak (Siyamak 
) , throughout the world, is a very rare cognomen. The surname Siyamak is habitual in Iran, where it is a very rare surname, Australia, and China, where it is an extremely rare surname. Much more frequently, Siyamak is the forename as well as the last name.
Ahl, Eslami, Hamidi, Hejazi, Ziyaei, Mousavi, Sadeghi, Sharifi, Soltani, Bahrami, Beikleik, Borjian, Rahmani, Zohrabi, Mohamadi, Moghadam, Shahbazi, Alizadeh, Keshmiri, Khorrami, Javadian, Ebrahimi, Nasiri, Jafari, Rahimi, Pourat, Rad, Abdi, Nani, Mesri, Asadi, Azizi, Baher, Rezai, Javid, Zarei, Mohammadi, Maleki, Moradi, Sarabi, Samimi, Sasani, Safari, Shahab, Alvand, Afshar, Khayri, Pakbaz, Madady, and Taghizadeh