Last name Issay (Исай 
, イサイ 
, Issay 
) , across the world, is quite a rare cognomen. The surname Issay is habitual in Bulgaria, where it is quite a rare surname, Bahrain, and Armenia, where it is a rare surname. Measured by absolute frequency, this name is the most popular in Bulgaria, Russia, and the Democratic Republic of the Congo. Also, Issay is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Исай | Kazakhstan, Armenia, Russia, Belarus, Bulgaria |
| イサイ | Japan |
| Issay | Malaysia, Mexico, Tanzania, Bahrain, Democratic Republic of the Congo |
| Іссай | Ukraine |