Cognomen Muthuraj (Muthuraj 
) , in the world, is quite a rare last name. The cognomen Muthuraj is habitual in Western Asia, particularly United Arab Emirates, where it is a rare surname, Oman, and Kuwait. In absolute terms, it is the most numerous in India, United Arab Emirates, and Malaysia. Likewise, Muthuraj is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Muthuraj | United Arab Emirates, Saudi Arabia, Malaysia, India, Oman |
| g. muthuraj Indian footballer (1927-2006), IN (b. 1927) |
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| t. muthuraj Film production designer, IN (b. 1969) |
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| muthusivaramapandian muthuraj researcher |
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| joseph gnanaseelan muthuraj |
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