Cognomen Pildayn (Pildayn 
) , around the globe, is a very rare family name. The surname Pildayn is characteristic of Latin America and the Caribbean, particularly Argentina, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Pildayn | Argentina |
| margarita pildayn Paraguayan singer, PY (b. 1940) |
|