Cognomen Viswanathan (Viswanathan 
, விசுவநாதன்) , in the entire world, is a common family name. The family name Viswanathan is habitual in Western Asia, particularly United Arab Emirates, where it is quite a common surname, Bahrain, and Qatar, where it is quite a rare surname. Measured by absolute frequency, it is the most numerous in India, United Arab Emirates, and Malaysia. More frequently, Viswanathan is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Viswanathan | Saudi Arabia, Malaysia, India, United Arab Emirates, United States |
Viswànathan, and Висванатхан
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kasi viswanathan Indian film editor, IN (b. 1937) |
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t. k. viswanathan Indian politician, IN (b. 1948) |
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viswanathan raghunathan Indian academic, IN (b. 1954) |
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| v. viswanathan Indian politician (1909-1987) (b. 1909) |
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ashoke viswanathan Indian film director, IN (b. 1959) |
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| raman viswanathan IN (b. 1899) |
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| c. k. viswanathan Indian politician, IN (b. 1922) |
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| t. viswanathan Indian musician, IN (b. 1927) |
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| n. viswanathan actor, academic, IN (b. 1929) |
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| viswanathan ratnam Indian judge (b. 1932) |
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| tirunilayi ramakrishna viswanathan (b. 1924) |
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| radha viswanathan Indian singer (1934-2018), IN (b. 1934) |
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nikil viswanathan American software engineer, US (b. 1987) |
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| k. p. viswanathan Indian politician, IN (b. 1940) |
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| m.venkatesan viswanathan botanist (b. 1942) |
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