Last name Ponnuswamy (Ponnuswamy 
) , around the world, is quite a rare family name. The cognomen Ponnuswamy is characteristic of Oman, where it is a rare surname, United Arab Emirates, and Malaysia. In absolute terms, it is the most numerous in India, Malaysia, and the United States. Also, Ponnuswamy is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Ponnuswamy | United Arab Emirates, Oman, India, Malaysia, United States |
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e. ponnuswamy Indian politician, IN (b. 1936) |
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| ponnuswamy rangaswamy Indian weightlifter (b. 1964) |
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| ponnuswamy govindaswamy ramesh Indian businessperson (born 1968, child of Govindaswamy), IN (b. 1968) |
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| ponnuswamy konguvel chess player (b. 1973) |
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| amirthavarshini ponnuswamy researcher |
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| p. ponnuswamy botanist |
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| ponnuswamy vijayaraghavan researcher |
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| mannar jawahar ponnuswamy researcher (ORCID 0000-0001-7824-0133) |
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| ponnuswamy sadayappan American electrical engineer |
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