Cognomen Rajan (Rajan 
, Раян 
, Раджан 
) , around the globe, is a widespread surname. The cognomen Rajan is characteristic of Western Asia, particularly United Arab Emirates, where it is a common surname, Oman, where it is quite a common surname, and Qatar (explore the name in all countries). Measured by absolute frequency, the name is most common in India, United Arab Emirates, and Saudi Arabia. More frequently, Rajan is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Rajan | United Arab Emirates, Malaysia, India, Saudi Arabia, Nepal |
| Раян | Bulgaria, Kazakhstan, Ukraine, Kyrgyzstan, Russia |
| Раджан | Kazakhstan, Azerbaijan, Ukraine, Kyrgyzstan, Russia |
| Райан | Ukraine, Russia, Kyrgyzstan, Kazakhstan |
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t. s. s. rajan Indian politician, IN (b. 1880) |
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p. t. rajan Indian politician and lawyer (1892-1974), IN (b. 1892) |
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m.s. rajan Indian academic, IN (b. 1920) |
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p. t. r. palanivel rajan Indian politician, IN (b. 1932) |
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m. s. sundara rajan Indian economist, IN (b. 1950) |
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| sreedhar rajan Indian film maker and critic, IN (b. 1901) |
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amitabh rajan Indian bureaucrat (b. 1955) |
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palanivel thiaga rajan Indian politician, IN (b. 1966) |
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smitha rajan musical artist (b. 1969) |
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delhi p. sunder rajan Indian musician, IN (b. 1969) |
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| balachandra rajan Indian writer, IN (b. 1920) |
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kohulan rajan Researcher |
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hridesh rajan American data scientist |
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jacob rajan New Zealand actor and playwright, NZ |
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kanaka rajan Indian neuroscientist, IN |
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Ha, Kumar, Patil, Patel, Gupta, Varma, Verma, Yadav, Mandal, Manjhi, Mahato, Mishra, Sharma, Pandey, Paswan, Prasad, Pillai, Thakur, Thomas, Tiwari, Chauhan, Shrestha, Arora, Chaudhary, Singh, Naik, Sah, Bai, Pal, Ram, Raj, Ray, Rai, Dei, Das, Lal, Jha, Saha, Sahu, Shah, Shri, Soni, Babu, Devi, Giri, Jain, Nair, Mahto, and Chaudhari