Worldwide, Must (Must 
, Musu 
, Mustum 
) is a common unisex first name. The given name Must is habitual in Algeria, where it is quite a rare boy's name, Morocco, and Indonesia, where it is a rare primarily male, but very seldom girly name. Measured by absolute frequency, it most frequently occurs in India, Algeria, and Indonesia. Also, Must is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Must | Indonesia, Italy, Algeria, Morocco, India |
| Musu | Indonesia, Italy, Liberia, India, Myanmar |
| Mustum | India, France, United States, Australia |
| Муст | Kazakhstan, Russia, Ukraine |