Surname Sumadi (Sumadi 
) , in all the world, is a common last name. The surname Sumadi is characteristic of South-eastern Asia, particularly Brunei, where it is quite a rare surname, Indonesia, and Malaysia. Not in comparison with a country's population, the name is most common in South-eastern Asia, particularly Indonesia, Malaysia, and Singapore. Also, Sumadi is the forename as well as the last name.
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| Sumadi | Saudi Arabia, Singapore, Malaysia, India, Indonesia |
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budi karya sumadi Indonesia Minister of Transportation, ID (b. 1956) |
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| ani sumadi Indonesian television presenter in Indonesia, ID (b. 1939) |
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| anastasius sumadi ID (b. 1962) |
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| maryoto sumadi Indonesian bureaucrat, ID |
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