Surname Rajasingam (Rajasingam 
) , in the entire world, is quite a rare family name. The last name Rajasingam is characteristic of Sri Lanka, where it is quite a rare surname, Malaysia, and Singapore, where it is a rare surname. Not in comparison with a country's population, it is the most numerous in Sri Lanka, Malaysia, and Australia. Very seldom, Rajasingam is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Rajasingam | United Kingdom, Sri Lanka, Malaysia, Australia, Canada |
| prasanthan rajasingam Ph.D. Southern Illinois University at Carbondale 2016 |
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| ruth rajasingam lawyer, teacher |
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| rajasingam s jeyendran researcher |
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| dinesh a/l rajasingam association football player, MY (b. 1995) |
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Mr, Shaun, Suren, Sutha, Kuhan, Rathi, Radha, Rahul, Divya, Saima, Donal, Vinod, Vidya, Vimal, Indra, Irene, Mathan, Mithun, Saruka, Gowry, Shugan, Yogi, Niro, Ms, Sam, Sai, Abi, Pat, Raj, Liz, Uma, Ivan, Miss, Anes, Arun, Puan, Ruth, Devi, Leon, John, Jeya, Anne, and Singam