Surname Dillehay (Dillehay 
) , worldwide, is a rare cognomen. The last name Dillehay is habitual in the United States, where it is a rare surname, New Zealand, where it is a very rare surname, and Canada. In absolute terms, this name is the most popular in the United States, Canada, and Germany.
| VARIANT | COUNTRY |
|---|---|
| Dillehay | Canada, Venezuela, New Zealand, United States, Germany |
|
tom dillehay American anthropologist, US (b. 1947) |
|
| ronald c. dillehay social psychologist |
|