Last name Gajni (Gain 
, Gajni 
, Gagner 
) , around the globe, is a widespread family name. The family name Gajni is characteristic of India, where it is quite a common surname, Bangladesh, where it is quite a rare surname, and Qatar. Not in comparison with a country's population, it is the most numerous in India, Bangladesh, and the United States. Very seldom, Gajni is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Gain | Philippines, United States, India, Bangladesh, France |
| Gajni | Germany, Saudi Arabia, North Macedonia, United States, India |
| Gagner | United Kingdom, United States, India, Canada, France |