Surname Shanmugham (Shanmugham 
) , all over the world, is quite a rare last name. The last name Shanmugham is characteristic of Bahrain, where it is quite a rare surname, Malaysia, where it is a rare surname, and United Arab Emirates. Measured by absolute frequency, it is the most numerous in India, Malaysia, and the United States. Also, Shanmugham is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Shanmugham | Saudi Arabia, United States, Malaysia, India, United Arab Emirates |
| thulukhanam shanmugham Olympic football player (1920-2012), IN (b. 1920) |
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| shanmugham ponniah Indian businessperson (born 1945, child of Ponniah), IN (b. 1945) |
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| m. shanmugham politician, IN |
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| manikantan shanmugham researcher (ORCID 0000-0002-3627-560X) |
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