Last name Zainudin (Zainudin 
, Зайнудин 
, Заинудин ) , worldwide, is a common surname. The family name Zainudin is habitual in South-eastern Asia, particularly Malaysia, where it is quite a common surname, Brunei, and Singapore, where it is quite a rare surname. In absolute terms, it is commonest in South-eastern Asia, particularly Malaysia, Indonesia, and Singapore. Very seldom, Zainudin is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Zainudin | Indonesia, Saudi Arabia, Malaysia, Philippines, Singapore |
| Зайнудин | Kyrgyzstan, Kazakhstan, Russia, Belarus |
| Заинудин | Russia |
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zainudin amali Indonesian politician, ID (b. 1962) |
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| zainudin fananie ID (b. 1908) |
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| zainudin booy Indonesian politician (born 1966), ID (b. 1966) |
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| zainudin ahmad ID (b. 1956) |
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| zainudin paru Indonesian politician (born 1971), ID (b. 1971) |
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| m. zainudin ID (b. 1962) |
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| zainudin hasan ID (b. 1965) |
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| mohd khairi zainudin Malaysian footballer, MY (b. 1978) |
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| nur ain izzati mohd zainudin researcher |
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| zainudin arsad Ph.D. Heriot-Watt University 2002 |
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| maizura mohd zainudin researcher (ORCID 0000-0003-1289-8092) |
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| nur hamizah mohd zainudin researcher (ORCID 0000-0001-5399-0659) |
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| sueziani b zainudin researcher (ORCID 0000-0003-1686-0358) |
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| e s zainudin researcher |
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| zainudin hamidy Indonesian political candidate, ID |
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