>
Cognomen Hagai (Hagai
, חגי
, ハガイ
, among others...) , in all the world, is quite a common family name. The surname Hagai is characteristic of Israel, where it is quite a common surname, Tanzania, where it is quite a rare surname, and Azerbaijan. Not in comparison with a country's population, it is the most numerous in Israel, Tanzania, and Indonesia. Likewise, Hagai is the forename as well as the last name.