Last name Nadarajah (Nadarajah 
, நடராஜா) , across the world, is a common cognomen. The last name Nadarajah is characteristic of Sri Lanka, where it is quite a common surname, Malaysia, and Singapore, where it is quite a rare surname. In absolute terms, it is commonest in Malaysia, Sri Lanka, and Canada. Very seldom, Nadarajah is the forename as well as the last name.
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| Nadarajah | Sri Lanka, Malaysia, Australia, Canada, France |
| n. nadarajah Ceylon Tamil lawyer (b. 1897) |
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| r. p. nadarajah badminton player, LK (b. 1928) |
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fabienne nadarajah Austrian swimmer, AT (b. 1985) |
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| thanabalan nadarajah retired Malaysian footballer (b. 1943) |
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| sarojini nadarajah badminton player, LK (b. 1953) |
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| nadarajah selvarajah Sri Lankan writer, IN (b. 1954) |
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| indi nadarajah Malaysian actor, MY (b. 1959) |
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| damien nadarajah cricketer, LK (b. 1968) |
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| m. nadarajah politician |
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| saralees nadarajah Ph.D. University of Sheffield 1994 |
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| nadarajah asokan Ph.D. University of Waterloo 1998 |
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| nadarajah vasanthan researcher (ORCID 0000-0001-8451-8904) |
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| sivadev nadarajah researcher |
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| nadarajah sreeharan researcher (ORCID 0000-0002-4839-6804) |
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| niroshan nadarajah researcher (ORCID 0000-0002-6486-9675) |
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