Last name Muscus (Muske 
, Musk 
, Musgo 
) , in all the world, is quite a common family name. The last name Muscus is habitual in the United Kingdom, where it is a rare surname, Israel, and New Zealand. Measured by absolute frequency, it is commonest in India, the United States, and the United Kingdom. Very seldom, Muscus is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Muske | Germany, Belgium, United States, India, Canada |
| Musk | Germany, United Kingdom, Australia, United States, India |
| Musgo | Spain, United States, Ecuador, Brazil, Venezuela |
| Muscus | Venezuela, Netherlands, Colombia, United States |