Family name Haylly (Haylly 
) , throughout the world, is an extremely rare cognomen. The surname Haylly is characteristic of Latin America and the Caribbean, particularly Venezuela, where it is an extremely rare surname. More frequently, Haylly is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Haylly | United Kingdom, Brazil, United States, Peru, Venezuela |