Last name Koushik (Koushik 
, কৌশিক ) , all around the world, is quite a common family name. The family name Koushik is habitual in Bangladesh, where it is quite a rare surname, Qatar, where it is a rare surname, and United Arab Emirates. In absolute terms, it most frequently occurs in India, Bangladesh, and the United States. More frequently, Koushik is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Koushik | Bangladesh, United Arab Emirates, United States, India, Saudi Arabia |
| কৌশিক | Bangladesh |
| vishwambharnath sharma koushik Hindi short story writer (b. 1899) |
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| k. m. koushik Member of Parliament, IN (b. 1906) |
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| dibyashree koushik researcher (ORCID 0000-0002-7609-3544) |
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| anita koushik researcher |
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| v koushik Indian cricketer (b. 1992) |
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| atul satya koushik IN (b. 1985) |
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De, Mandal, Mondal, Santra, Sardar, Sarkar, Barman, Biswas, Naskar, Halder, Samanta, Debnath, Ganguly, Goswami, Majumdar, Banerjee, Bhowmick, Karmakar, Pramanik, Mukherjee, Chowdhury, Chatterjee, Hazra, Nandi, Ghosh, Dutta, Sen, Bag, Kar, Pal, Ray, Roy, Dey, Das, Maji, Saha, Chakraborty, Bera, Paul, Jana, Manna, Malik, Maity, Mitra, Kundu, Kumar, Patra, Reddy, Bose, and Bhattacharya