Worldwide, Sumathi (Sumathi 
) is a common female given name. The first name Sumathi is habitual in India, where it is quite a rare feminine name, Qatar, and Kuwait, where it is quite a rare gender-neutral name. Not in comparison with a country's population, this name is the most popular in India, Malaysia, and the United States. Much less frequently, Sumathi is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Sumathi | Malaysia, India, United States, Singapore, Sri Lanka |
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sumathi srinivas Indian entrepreneur and publisher, IN |
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| sumathi rao Indian physicist, IN (b. 1956) |
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| ramamurthy sumathi botanist (b. 1974) |
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| sumathi sowrirajan researcher |
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| sumathi murthy Hindustani classic vocalist and civil rights activist |
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| thangarajan sumathi researcher (ORCID 0000-0003-0830-3498) |
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| sumathi sethupathi researcher |
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| shanmugam sumathi researcher (ORCID 0000-0003-1724-1719) |
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| sumathi rao Ph.D. State University of New York at Stony Brook 1983 |
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| sumathi natarajan researcher |
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| sumathi nambiar researcher |
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| sumathi ramachandran researcher |
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| sumathi parasuraman researcher |
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| nidumolu sumathi Indian percussionist, IN |
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| sumathi k. misra physician |
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Mani, Ganesan, Muniandy, Selvaraj, Arumugam, Kanapati, Krishnan, Ramasamy, Marimuthu, Shanmugam, Perumal, Katamuthu, Jayabalan, Narayanan, Srinivasan, Subramanian, Subramaniam, Paramasivam, Balakrishnan, Ramakrishnan, Ramachandran, Rajendran, K R Krishnan Kutty, Manohar, Gaddam, Suma, Sumi, Amma, Raja, Ravi, Devi, Nair, Mathi, Mohan, Mogan, Bandi, Kumar, Raman, Reddy, Maniam, Shetty, Suresh, Challa, Kannan, Ramesh, Dasari, Thiyagarajan, and Parthasarathy