Family name Rajah (Rajah 
, راجا, राजा) , around the world, is quite a common cognomen. The family name Rajah is characteristic of Sri Lanka, where it is quite a common surname, Malaysia, and Qatar, where it is quite a rare surname. In absolute terms, it is commonest in Malaysia, Sri Lanka, and Saudi Arabia. Much less frequently, Rajah is the forename as well as the last name.
| m. c. rajah Indian politician (1883-1943), IN (b. 1883) |
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v. k. rajah Attorney-General of Singapore and former judge, SG (b. 1957) |
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indranee rajah Singaporean politician, SG (b. 1963) |
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| t. t. rajah Lawyer who joined the People's Action Party (PAP) in 1954 and was elected its Secretary-General in 1957, SG (b. 1919) |
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| k. s. rajah lawyer and former Judicial Commissioner, MY (b. 1930) |
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| carol selva rajah Australian cookery writer and educator, SG (b. 1938) |
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| goolam rajah South African pharmacist, cricket administrator and team manager of South Africa national cricket team (1946-2021), ZA (b. 1946) |
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| peter rajah Malaysian association football player (1951-2014), MY (b. 1951) |
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| aneil rajah Trinidadian cricketer, TT (b. 1955) |
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| gavin rajah South African fashion designer, ZA (b. 1970) |
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| maaran michael rajah researcher (ORCID 0000-0002-6674-8850) |
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| jothie rajah Singaporean academic |
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| maria natasha rajah professor and researcher in cognitive neuroscience |
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| andrew rajah Ph.D. Universiti Sains Malaysia 1997 |
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| emile rajah Trinidadian cricketer, TT (b. 1987) |
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