Sirine

Sirines are beautiful, human-like females, at home in any aquatic environment. They have human skin tones ranging to a light yellow-green, and their hair can be almost any color, though silver and dark green are the most common. Sirines have beautiful figures and wear scanty clothing at best.

Most sirines are antisocial, so they try to drive intruders away, with evil sirines taking stronger measures. Other sirines are hungry for social interaction and try to lure male humans or humanoids to join them for a time.

Sirines speak their own language and the languages of the nearest intelligent races. They can breathe water and air, and they have infravision to a range of 120 feet.

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Source: bgee/original_manuals/baldurs_gate_1_ee_sword_coast_survival_guide.pdf — "Some Monsters of the Sword Coast" → "Sirine".