Family name แก่ (To 
, Kae 
, แก่) , in the entire world, is a widespread cognomen. The family name แก่ is characteristic of Hong Kong, where it is a common surname, Bermuda, and Cayman Islands, where it is quite a common surname (explore the name in all countries). Measured by absolute frequency, it most frequently occurs in Indonesia, Hong Kong, and Myanmar. More prevalently, แก่ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| To | Japan, Indonesia, Myanmar, Egypt, Hong Kong |
| Kae | China, Myanmar, Vietnam, Indonesia, Hong Kong |