Family name Kaustuv (Kaustuv 
) , around the globe, is a very rare last name. The last name Kaustuv is characteristic of the United States, where it is an extremely rare surname, and India. Predominantly, Kaustuv is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kaustuv | Germany, Finland, Nepal, United States, India |
De, Mondal, Mishra, Sarkar, Chanda, Bagchi, Biswas, Keshri, Mohanty, Ganguly, Goswami, Majumder, Majumdar, Sengupta, Banerjee, Karmakar, Dasgupta, Mukherjee, Chowdhury, Chatterjee, Chakraborty, Chakrabarti, Mandal, Nandi, Ghosh, Gupta, Sen, Pal, Ray, Roy, Deb, Dey, Das, Nag, Maji, Saha, Bhattacharya, Basu, Paul, Jana, Maiti, Mitra, Singh, Sinha, Kundu, Kiran, Datta, Dutta, Bose, and Bhattacharyya