Thread:Juraj103/@comment-27075564-20171115015842/@comment-24448826-20180212055208

You guessed it. In Polish the word "syrena" can be used for both classic mermaid and Greek mithology-esque sirens and its the word that appears in original "A Little Sacrifice". That would be the end of it, if creature called "panna morska" (more mermaidish Polish word for mermaid) wasn't used in The Tower. So, in books at least, siren = mermaid = havfrue (meaning siren in Skellige dialect).