Cognomen Caillech (Cailleach 
, Caillech ) , in all the world, is an extremely rare family name. The surname Caillech is characteristic of Spain, where it is an extremely rare surname, and the United States. Much less frequently, Caillech is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Cailleach | United States, Spain |
| Caillech | United States |