Surname Лучай (Luchai 
, Luchay 
, Лучай 
) , across the world, is a rare cognomen. The last name Лучай is habitual in Belarus, where it is a very rare surname, Thailand, and Russia. Measured by absolute frequency, it is commonest in Russia, Thailand, and India. More frequently, Лучай is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Luchai | Thailand, South Africa, Malaysia, India, China |
| Luchay | Myanmar, India, United States, Canada |
| Лучай | Ukraine, Russia, Belarus |