Cognomen Ratnasamy (Ratnasamy 
) , worldwide, is quite a rare family name. The surname Ratnasamy is characteristic of Sri Lanka, where it is quite a rare surname, Malaysia, and Singapore, where it is a rare surname. In absolute terms, the name is most common in Malaysia, Sri Lanka, and the United States. Very seldom, Ratnasamy is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Ratnasamy | United States, Malaysia, India, Sri Lanka, United Arab Emirates |
| paul ratnasamy Indian catalyst scientist, IN (b. 1942) |
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| sylvia ratnasamy Belgian scientist, BE (b. 1976) |
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| ratnasamy vithiya researcher |
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| ratnasamy somanathan researcher |
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Mr, Jothi, Julia, Varun, Frank, Indra, Isaac, Santhi, Saruja, Lucia, Samuel, Suresh, Sylvia, Bithia, Kamala, Reunka, Denesh, Daniel, Jaroja, Shivek, Joshua, Lancy, Kevin, Ms, Sam, Raj, Uma, Mary, Aman, Amol, Paul, Kumar, Raja, Gwen, Lela, John, Nagu, Shoba, Annie, Kalai, Kayla, Divy, and Thomas