Cognomen Hollay-Detarr (Hollay-Detarr 
) , around the globe, is an extremely rare last name. The family name Hollay-Detarr is characteristic of Northern America, particularly the United States, where it is an extremely rare surname. Parts of the name also exists independently as a last name Hollay, and a last name Detarr.
| VARIANT | COUNTRY |
|---|---|
| Hollay-Detarr | United States |