Last name กจ (Kot 
, กจ 
) , all over the world, is a common cognomen. The family name กจ is characteristic of Poland, where it is quite a common surname, Macao, and Hong Kong, where it is quite a rare surname. Measured by absolute frequency, it is the most numerous in Poland, India, and the United States. Likewise, กจ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kot | Egypt, India, Taiwan, United States, Poland |
| กจ | Thailand |