Cognomen Ly-Diep (Ly-Diep 
) , in the world, is an extremely rare surname. The surname Ly-Diep is characteristic of Australia and New Zealand, particularly Australia, where it is a very rare surname. Parts of the name also exists independently as a last name Ly, and a last name Diep.
| VARIANT | COUNTRY |
|---|---|
| Ly-Diep | Australia |