Siren: an enticing yet dangerous woman...
"What potions have I drunk of Siren tears..."
(Shakespeare, Sonnet 119)
In Greek mythology, sirens were sea nymphs with voices so sweet that mariners who heard their songs were lured into grounding their boats on the rocks on which the beautiful nymphs sang.
In myth and folklore, similarities frequently exist between the stories about mermaids and sirens.
The naiad was a nymph presiding over fountains, wells, springs, streams, and brooks. Naiads could be dangerous: according to Greek mythology, Hylas of the Argo's crew was lost when he was taken by naiads.
Beware the siren's song of the temptress: bewitching, alluring, dangerous...