Family name Kusil (Kusil 
) , throughout the world, is a very rare last name. The cognomen Kusil is habitual in Philippines, where it is a very rare surname, Malaysia, where it is an extremely rare surname, and India. More frequently, Kusil is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kusil | India, Malaysia, United States, Philippines |