Family name Зайнул (Zainul 
, Zaynul 
, Зайнул 
) , in the entire world, is quite a common cognomen. The last name Зайнул is characteristic of Malaysia, where it is quite a rare surname, Indonesia, and United Arab Emirates, where it is a rare surname. Measured by absolute frequency, it is the most numerous in Indonesia, Malaysia, and Bangladesh. More frequently, Зайнул is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Zainul | Indonesia, Malaysia, Bangladesh, Saudi Arabia, India |
| Zaynul | Indonesia, United States, Bangladesh, South Africa, India |
| Зайнул | Russia, Kazakhstan, Ukraine, United States, Belarus |
| Zajnul | India |