Last name Muusi (Muusi 
) , around the world, is a rare cognomen. The family name Muusi is habitual in Kenya, where it is a rare surname, Finland, where it is a very rare surname, and Tanzania. Measured by absolute frequency, it most frequently occurs in Kenya, Tanzania, and India. Very seldom, Muusi is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Muusi | Tanzania, India, Finland, Kenya |