I think the most common surnames found in all ICC full member nations should be included. In the case of India and Pakistan, the most common surnames in all ethnic groups should be included.
Here are the most common surnames in my native Bangladesh (also common among Muslim people around South Asia in general):
Hasan, Hossain, Rahman, Ahmed, Islam, Ali, Khan, Mahmud, Akhtar, Haque, Mirza, Bhuiyan, Miah, Patowary, Shikdar, Talukdar, Alam, Karim, Chowdhury, Anam, Hashem, Barek, Hakim, Qazi, Kabir, Iqbal, Khondokar, Mohammad, Farouque, Umar, Abdul, Huda, Latif, Shaheed, Uddin, Rabbani, Zaman, Abedin, Imam, Jahangir, Sultan, Ahsan, Bacchu, Farid, Akbar, Jahid, Shuvo, Sadiq, Jalil, Elahi, Quadir, Ishrak, Ghani, Shiraj, Mahboob, Nizam, Razzak, Kamal, Mullah.
Exclusive to females in Bangladesh (and Muslim South Asians):
Begum, Ara, Khatun, Sultana, Un-Nesa, Husna, Laila, Banu, Fariha, Bibi, Nusrat, Mim, Sara, Suraiya.
Exclusive to Hindus in Bangladesh and West Bengal of India:
Ghosh, Basu(Bose), Biswas, Das, Dasgupta, Sen, Sengupta, Bhowmick, Dey, Chakraborty, Roy, Mitra, Halder, Mondol, Karmakar, Debnath, Saha, Ganguly, Mukherjee, Banerjee, Chatterjee, Dutta, Sarkar, Goswami, Guha, Thakur, Mallik, Gupta, Kundu, Maitra, Chanda, Sil, Shome, Pal, Adhikari, Hazra, Basak, Bhaduri, Gayen, Nag, Bhattacharya, Bagchi, Sensharma, Ghatak, Purakayastha, Barman, Patra, Pramanik.