Surname Илаи (Ilai 
, Илаи 
) , globally, is quite a rare last name. The family name Илаи is characteristic of Papua New Guinea, where it is quite a rare surname, Israel, where it is a rare surname, and New Zealand. Measured by absolute frequency, it is commonest in India, Papua New Guinea, and Malaysia. More frequently, Илаи is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ilai | Malaysia, Fiji, Papua New Guinea, India, Israel |
| Илаи | Russia |