Cognomen Sadasivan (Sadasivan 
) , throughout the world, is quite a common surname. The cognomen Sadasivan is habitual in United Arab Emirates, where it is quite a rare surname, Maldives, and Oman. Not in comparison with a country's population, the name is most common in India, United Arab Emirates, and Malaysia. More prevalently, Sadasivan is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Sadasivan | South Africa, United Arab Emirates, India, Malaysia, Saudi Arabia |
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ayiroor sadasivan musician, IN (b. 1939) |
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balaji sadasivan Singaporean politician and neurosurgeon (1955-2010), SG (b. 1955) |
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| s.n. sadasivan Indian civil service doer, IN (b. 1926) |
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anoop sadasivan Indian artist, IN |
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| viswa sadasivan Singaporean politician (b. 1959) |
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| sivalal sadasivan researcher ORCID ID = 0000-0002-0181-5223 |
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| arun sadasivan researcher ORCID ID = 0000-0001-9031-6073 |
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| janani sadasivan researcher |
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| sadasivan puthusserypady researcher |
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| kalesh sadasivan Indian entomologist, IN |
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| sadasivan shaji researcher |
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| arun sadasivan researcher (ORCID 0000-0003-0401-5229) |
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| sadasivan chittalakkottu researcher |
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| chander sadasivan researcher |
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| suja sadasivan |
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Mg, Moodley, Moopnar, Sivaram, Perumal, Thampan, Naicker, Madhavan, Santhosh, Chinniah, Chettiar, Govender, Unnithan, Sukumaran, Anilkumar, Chettiyar, Narayanan, Ramamurthi, Vidyasagar, Venkatesan, Subramanian, Karthikeyan, Naidoo, Neelakantan, Nanu Panicker, Rajeev, Arun, Nair, Iyer, Muthu, Sivan, Asari, Kumar, Pilla, Plala, Reddy, Nadar, Nayar, Naidu, Sivaji, Sumesh, Achari, Achary, Chetty, Pilala, Pillai, Pillay, Thampi, and Dharmakeerthi