Last name Зайнуддин (Zainuddin 
, Зайнуддин 
, Zaynuddin 
) , in the entire world, is a common surname. The last name Зайнуддин is characteristic of Malaysia, where it is a common surname, Bahrain, where it is quite a common surname, and Brunei. Measured by absolute frequency, this name is the most popular in Malaysia, Indonesia, and Bahrain. Also, Зайнуддин is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Zainuddin | Indonesia, Malaysia, Singapore, India, Bahrain |
| Зайнуддин | Kyrgyzstan, Kazakhstan, Russia, Tajikistan |
| Zaynuddin | Indonesia, United Kingdom, Malaysia, United States, India |