Sadaf

The word Sadaf means sea-shell. A sea-shell is a hard, protective outer layer usually created by an animal that lives in the sea. Also the Pearl is born inside sea-shell.

Sadaf is the mother-of-pearl.

Asdaf

Asdaf is a persian/arabic name means Seashells.

It commonly refers to a boy with beuty, intelligence and morals.
Asdaf is the plural form of Sadaf

I found Asdaf on the beach.