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 | Malaysia, Indonesia, Saudi Arabia, India, Bangladesh |
| Zaynul | Indonesia, South Africa, United States, India, Bangladesh |
| Зайнул | Russia, Belarus, Kazakhstan, Ukraine, United States |
| Zajnul | India |