[10000truths]

Why would Siren be an inappropriate name?

[lostgame]

Someone who I know has the last name ‘Island’ and was unable to sign up for Facebook forever because they thought it was a fake last name.

Maybe ‘Siren’ is similar. It’s a pre-existing word that perhaps flags some sort of weird edge case.

[LordDragonfang]

My best guess is the Sirens of greek myth, who are often (incorrectly) depicted as sexual temptresses. Bit of a stretch, though.