Doña Sirena, poor widow and matchmaker in "Los intereses creados" (1907) by Jacinto Benavente
Sing, siren, for thyself, and I will dote: / Spread o'er the silver waves thy golden hairs. [Shakespeare, "The Comedy of Errors"]
Sirena, main character in Mako Mermaids
Means "mermaid" in Spanish and Slovenian
Sirena, a type of Alpha in the book "Undertow."