Cognomen Istak (Istak 
, Истак 
) , in all the world, is quite a rare family name. The cognomen Istak is habitual in Saudi Arabia, where it is a rare surname, India, and Greece, where it is a very rare surname. In absolute terms, it most frequently occurs in India, Saudi Arabia, and Philippines. More frequently, Istak is the forename as well as the last name.
Mo, Ahmed, Khann, Husen, Mallik, Mondal, Saiekh, Sayyad, Shaikh, Ansari, Ansary, Ahmmed, Ahamad, Ahamed, Pathan, Husain, Mansuri, Hossain, Hussain, Mahammad, Mohammad, Mohammed, Ahmad, Muhammad, Shekh, Miyan, Mu, Sk, Bi, Sha, Sek, Ali, Bal, Beg, Kha, Kho, Miya, Saha, Shah, Sekh, Alam, Alli, Bano, Khan, Khon, Molla, Momin, Shaik, and Kuraishi