Cognomen Thiagarajan (Thiagarajan 
) , across the world, is quite a common surname. The cognomen Thiagarajan is characteristic of Malaysia, where it is quite a rare surname, Singapore, and United Arab Emirates. Not in comparison with a country's population, it is the most numerous in India, Malaysia, and the United States. Very seldom, Thiagarajan is the forename as well as the last name.
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| Thiagarajan | United Arab Emirates, Singapore, United States, Malaysia, India |
Thiagarjan, and Тхиагарайан
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t. m. thiagarajan South Indian Carnatic Musician, IN (b. 1923) |
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| n. r. thiagarajan Indian politician, IN (b. 1913) |
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thiagarajan kumararaja Indian film director, IN (b. 1976) |
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| n. thiagarajan Indian photojournalist, IN (b. 1933) |
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| sivasailam thiagarajan (b. 1938) |
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| p. s. thiagarajan (b. 1948) |
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| thiagarajan ramani Indian musician, IN (b. 1962) |
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| tara c thiagarajan researcher |
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| karate r. thiagarajan Indian politician, IN |
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| anuradha thiagarajan researcher |
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| karthy thiagarajan researcher |
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| a. thiagarajan Indian politician, IN |
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| arvind thiagarajan Ph.D. Massachusetts Institute of Technology 2011 |
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| ravi r thiagarajan researcher |
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| thiagarajan venkataraman researcher |
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