The name Sirena is a girl's name of Greek origin meaning "entangler". Sirena and is often added to user-created lists like Mermaid Names and discussed in our forums with posts like "Names on NB that make you go WOW!".
From the experts:
Sounds like Serena, but refers to the mythological sirens -- half woman, half bird -- who virtually sang men to death. Not a great role model for your little girl.