Cognomen Declaro (Declaro 
) , around the world, is quite a rare family name. The family name Declaro is habitual in Philippines, where it is quite a rare surname, Qatar, where it is a rare surname, and United Arab Emirates. Not in comparison with a country's population, the name is most common in Philippines, the United States, and Saudi Arabia.
| VARIANT | COUNTRY |
|---|---|
| Declaro | Philippines, United Arab Emirates, Saudi Arabia, United States, Qatar |