The concepts Siren and Sirens seem to be about exactly the same mythological creatures, with many of the same games associated to both pages. Not sure whether the article name should be singular or plural but thought this was worth pointing out. On balance I'd go with "Sirens" since they are normally encountered in groups.
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One seems to have been intended to be a page related to an enemy type in Killing Floor and was misappropriated. I don't know much about Killing Floor, but that enemy doesn't seem to share anything in common with the sirens of legend, judging by the image.