Around the world, Janarthanan (Janarthanan 
) is quite a rare masculine first name. The forename Janarthanan is characteristic of Sri Lanka, where it is a rare boy's name, Oman, and Singapore. Measured by absolute frequency, this name is the most popular in India, Sri Lanka, and Saudi Arabia. Likewise, Janarthanan is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Janarthanan | United Arab Emirates, United States, India, Sri Lanka, Malaysia |
| kadambur r. janarthanan Indian politician, IN (b. 1929) |
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| janarthanan jayawickramarajah researcher (b. 1977) |
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| janarthanan sundaram researcher |
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| janarthanan sathananthan researcher |
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| janarthanan pushpamalar researcher |
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| janarthanan narayanasamy researcher |
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| janarthanan .j Indian politician, IN |
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