Last name Kastom (Kastom 
) , worldwide, is a rare surname. The cognomen Kastom is characteristic of Tanzania, where it is a rare surname, Malaysia, where it is a very rare surname, and Philippines. In absolute terms, it most frequently occurs in Tanzania, Indonesia, and Malaysia. Very seldom, Kastom is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kastom | Philippines, Tanzania, Malaysia, India, Indonesia |