Globally, Mustack (Mustack 
) is a very rare predominantly masculine, but scarcely female forename. The forename Mustack is habitual in Tanzania, where it is a very rare masculine name, and India, where it is an extremely rare largely male, but infrequently female name.
| VARIANT | COUNTRY |
|---|---|
| Mustack | United Kingdom, India, Malaysia, United States, Tanzania |