In the world, Chayan (Chayan 
, ชยันต์ , Чаян 
) is a common principally boy's, but scarcely female first name. The forename Chayan is habitual in Bangladesh, where it is quite a rare masculine name, Thailand, where it is quite a rare predominantly boy's, but very seldom girly name, and India. Very seldom, Chayan is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Chayan | Indonesia, Thailand, India, Bangladesh, Peru |
| ชยันต์, ชายันต์ | Thailand |
| Чаян | Kyrgyzstan, Kazakhstan, Russia, Ukraine |
| chayan mukherjee Indian police chief, IN (b. 1940) |
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| chayan khoï Iranian photographer, IR (b. 1963) |
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| chayan kumar saha researcher |
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| chayan das researcher ORCID ID = 0000-0002-9905-9218 |
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| chayan kumar mishra Ph.D. 1993 |
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| chayan dutta researcher ORCID ID = 0000-0003-4839-2245 |
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| chayan chakraborti researcher (ORCID 0000-0003-1673-4714) |
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| chayan munshi researcher (ORCID 0000-0002-4479-7475) |
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| chayan kumer saha researcher |
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| chayan k nandi researcher |
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De, Hazra, Mandal, Mondal, Sarkar, Sharma, Barman, Biswas, Naskar, Halder, Samanta, Agarwal, Debnath, Majumder, Majumdar, Sengupta, Adhikari, Banerjee, Mukherjee, Chowdhury, Chatterjee, Chakraborty, Ghosh, Gupta, Dutta, Patra, Sen, Kar, Pal, Ray, Roy, Deb, Dey, Das, Saha, Bera, Bhattacharya, Paul, Giri, Jana, Jain, Nath, Manna, Maity, Mitra, Singh, Kundu, Kumar, Devi, and Bhattacharjee