Family name Selvarajah (Selvarajah 
) , in all the world, is a common last name. The family name Selvarajah is habitual in Sri Lanka, where it is quite a common surname, Malaysia, where it is quite a rare surname, and Singapore. Measured by absolute frequency, the name is most common in Sri Lanka, Malaysia, and Canada. Much less frequently, Selvarajah is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Selvarajah | Canada, France, United Kingdom, Sri Lanka, Malaysia |
| brintha selvarajah researcher (ORCID 0000-0001-8342-9117) |
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| suganya selvarajah researcher (ORCID 0000-0003-4875-6002) |
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| luxshini selvarajah researcher (ORCID 0000-0002-5313-9212) |
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| senthooran selvarajah researcher |
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| mathu selvarajah researcher |
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| gayathri thevi selvarajah researcher ORCID id 0000-0001-7240-9882 |
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| sujitha selvarajah researcher |
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| dinesh selvarajah researcher (ORCID 0000-0001-7426-1105) |
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| arunan selvarajah researcher |
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| selvarajah rajivarnam Sri Lankan journalist, LK (b. 1982) |
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| kevin c. selvarajah badminton player, PT (b. 1999) |
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