Cognomen Thayver (Thayver 
) , all over the world, is an extremely rare family name. The surname Thayver is characteristic of Northern America, particularly Canada, where it is a very rare surname, and the United States, where it is an extremely rare surname. Very seldom, Thayver is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Thayver | Brazil, Canada, United States |