Cognomen Rayappu (Rayappu 
) , in all the world, is a very rare family name. The family name Rayappu is characteristic of Northern Europe, particularly Ireland, where it is a rare surname, Norway, where it is a very rare surname, and Denmark. Not in comparison with a country's population, it is the most numerous in Ireland, the United Kingdom, and Australia. Very seldom, Rayappu is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Rayappu | Australia, Ireland, United Kingdom, India, United States |