Family name ประแจ (Spanner 
, ประแจ 
) , around the world, is quite a rare cognomen. The family name ประแจ is habitual in Curacao, where it is quite a common surname, Austria, where it is quite a rare surname, and Slovakia. Measured by absolute frequency, the name is most common in Germany, the United Kingdom, and Austria. Very seldom, ประแจ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Spanner | Australia, Austria, Germany, United States, United Kingdom |
| ประแจ | Thailand |