Cognomen Unnithan (Unnithan 
) , throughout the world, is quite a common surname. The family name Unnithan is habitual in Western Asia, particularly United Arab Emirates, where it is quite a rare surname, Oman, and Qatar. In absolute terms, it most frequently occurs in India, United Arab Emirates, and Saudi Arabia. Much less frequently, Unnithan is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Unnithan | Saudi Arabia, United Arab Emirates, Malaysia, India, Oman |
| p. g. n. unnithan Indian politician, IN (b. 1898) |
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suresh unnithan Indian film director, IN (b. 1956) |
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| thottamon kantan kesavan narayanan unnithan (b. 1927) |
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| rajmohan unnithan Indian politician, IN (b. 1956) |
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| afeesh r unnithan researcher |
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| vikram unnithan researcher ORCID ID = 0000-0002-4656-3824 |
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| aka unnithan researcher |
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| ragaseema valsala madhavan unnithan researcher |
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| r. viswanathan unnithan helminthologist |
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| chandana unnithan researcher (ORCID 0000-0002-1832-8499) |
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| veena v unnithan researcher |
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| c.m. unnithan botanist |
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