Cognomen Ilapan (Ilapan 
) , throughout the world, is a very rare last name. The cognomen Ilapan is characteristic of Philippines, where it is a very rare surname, and India, where it is an extremely rare surname. Much less frequently, Ilapan is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ilapan | India, Philippines |