Around the world, ประแจ (Spanner 
, ประแจ 
) is a very rare boy's first name. The first name ประแจ is habitual in Sub-Saharan Africa, particularly Nigeria, where it is an extremely rare masculine name. Predominantly, ประแจ is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Spanner | Australia, Germany, United Kingdom, United States, Austria |
| ประแจ | Thailand |