Last name มัญจา (Mancha 
, Manchana 
, มัญจา ) , worldwide, is a common surname. The cognomen มัญจา is characteristic of Spain, where it is quite a common surname, Peru, where it is quite a rare surname, and Mexico. In absolute terms, it most frequently occurs in Spain, Mexico, and India. Much less frequently, มัญจา is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Mancha | Spain, Mexico, Nigeria, United States, India |
| Manchana | Thailand, India, South Africa, United States |
| มัญจา | Thailand |
| Mnja | India, South Africa, Malaysia, Myanmar |
บัวทรา, มิตรอุดม, สอนสุภาพ, and ประเคนคะชา