Surname Harmandayan (Harmandayan 
) , in all the world, is a very rare family name. The family name Harmandayan is characteristic of Lebanon, where it is a rare surname, Canada, where it is a very rare surname, and France. In absolute terms, the name is most common in Lebanon, Canada, and the United States.
| VARIANT | COUNTRY |
|---|---|
| Harmandayan | Lebanon, United States, France, Canada |