Family name Illeperuma (Illeperuma 
) , in all the world, is quite a rare last name. The family name Illeperuma is characteristic of Sri Lanka, where it is quite a rare surname, Australia, where it is a very rare surname, and Canada. Not in comparison with a country's population, it most frequently occurs in Sri Lanka, Australia, and the United States.
| VARIANT | COUNTRY |
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| Illeperuma | Australia, Canada, United States, United Kingdom, Sri Lanka |
| jayamini illeperuma Sri Lankan athlete, LK (b. 1967) |
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| rasika pawiththra illeperuma researcher |
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| widusha r.k. illeperuma Ph.D. Harvard University 2015 |
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| widusha r illeperuma researcher |
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Mr, Sachith, Chamara, Rochana, Dilhara, Loraine, Nadeera, Nadeeke, Imanthi, Widusha, Sanjeewa, Anuradha, Chamitha, Birendra, Tharindu, Tharinda, Thiranja, Thushara, Niroshan, Sakuntala, Sajeewani, Chinthaka, Sanjana, Ishara, Indika, Jagath, Ari, Don, Mdia, Supun, Anupa, Bunny, Kasun, Ranga, Ruwan, Dilan, Panchalee, Gayan, Inuri, Yasas, Udaya, Udara, Mahesh, Sudath, Bushan, Rasika, Dilini, Dimuth, Lanka, and Premasiri