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Last name Shagnik (Shagnik ) , globally, is an extremely rare cognomen. Much more frequently, Shagnik is the forename as well as the last name.
Шагник
Ray, Chowdhury, Saraswati, Mukherjee, Banerjee, Senngupta, Lahiri, Biswas, Chakraborty, Barman, Ghosh, Mitra, Paul, Bose, Saha, Das, Roy, Sanyal, and Bhattacharya