translate the nickname

Irien Elevasarë #5057

How would you translate the nickname "descended from mortal race" or "stars from mortal race" into Sindarin? And can Firindë be used as a name?

Celebrinor #5257

Firebgil would be "mortal-star".

How did you derive Firinde? It would be Quenya no Sindarin names end in ë.