Cognomen Gunaseelan (Gunaseelan 
) , worldwide, is quite a rare surname. The family name Gunaseelan is characteristic of Malaysia, where it is quite a rare surname, Sri Lanka, and United Arab Emirates, where it is a rare surname. Measured by absolute frequency, it is commonest in Malaysia, Sri Lanka, and India. Also, Gunaseelan is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Gunaseelan | United Arab Emirates, Sri Lanka, Malaysia, United States, India |
| v. gunaseelan Member of the Tamil Nadu Legislative Assembly, IN |
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| g. gunaseelan Sri Lankan Tamil physician and politician |
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| vinusha gunaseelan researcher |
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| saravanan gunaseelan researcher (ORCID 0000-0002-4593-8743) |
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| arivarignan gunaseelan Ph.D. Indian Institute of Technology, Madras 1987 |
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| mary kamala gunaseelan Sri Lankan Tamil teacher and politician |
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