Surname Sumanadasa (Sumanadasa 
) , worldwide, is quite a rare cognomen. The family name Sumanadasa is characteristic of Sri Lanka, where it is quite a rare surname, Malaysia, where it is a very rare surname, and the United Kingdom. Measured by absolute frequency, it is the most numerous in Sri Lanka, Malaysia, and the United States. Very seldom, Sumanadasa is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Sumanadasa | Malaysia, United Kingdom, Yemen, United States, Sri Lanka |
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sumanadasa abeywickrama Sri Lankan politician (1928-2006), LK (b. 1928) |
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| lh sumanadasa Engineer and university chancellor, LK (b. 1910) |
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| subathdrage d m sumanadasa researcher |
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Mr, Paudula, Ranmuthu, Dilusha, Dulanga, Dulangi, Janitha, Heather, Pandula, Maneesha, Supun Chamikara, Champika, Priyanka, Dhammika, Jayantha, Thushara, Maringahasithasdr, Maheesha, Manjula, Oyitiya, Nayana, Ken, Kim, Pium, Supun, Aruna, Dolly, Nimal, Esala, Hiran, Himal, Mayuri, Sunita, Sujani, Ananda, Anusha, Amanda, Jaliya, Priyantha, and Nishantha