In the entire world, Udayan (Udayan 
) is quite a common boy's first name. The given name Udayan is characteristic of Western Asia, particularly Oman, where it is quite a rare boy's name, Qatar, and United Arab Emirates. Not in comparison with a country's population, it most frequently occurs in India, Bangladesh, and Saudi Arabia. Much less frequently, Udayan is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Udayan | Saudi Arabia, United Arab Emirates, India, Oman, Bangladesh |
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udayan thakker Gujarati author, IN (b. 1955) |
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| udayan prasad British film director, GB (b. 1953) |
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| udayan guha Indian politician, IN (b. 1955) |
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| udayan vajpeyi Indian poet, IN (b. 1960) |
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| udayan namboodiry (b. 1963) |
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| udayan bandyopadhyay (b. 1967) |
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| udayan babubhai darji Ph.D. Auburn University 1991 |
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| udayan joseph researcher |
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| udayan chatterji researcher |
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| udayan k shah researcher |
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| udayan jayant deshpande Ph.D. Dartmouth College 2008 |
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| udayan ganguly researcher |
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| udayan mallik researcher |
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| udayan apte researcher |
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| udayan mukherjee Editor with CNBC India |
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Sen, Mishra, Sarkar, Sahgal, Sharma, Shukla, Chakma, Biswas, Pandey, Pillai, Goswami, Trivedi, Majumdar, Sengupta, Banerjee, Dasgupta, Mukherjee, Chowdhury, Chatterjee, Chakraborty, Bhattacharya, Chattopadhyay, Mondal, Bhattacharyya, Mandal, Joshi, Pal, Ray, Roy, Das, Saha, Shah, Basu, Bose, Guha, Jain, Nair, Mitra, Singh, Sinha, Barua, Bhatt, Kumar, Patel, Dutta, Gupta, Ghosh, Verma, and Bhattacharjee