Mermaid

The mermaid is a female creature, often depicted as a woman with a fish tail living in the sea, sometimes also in lakes or rivers.

Source
Mermaids originate from ancient Assyria. The mesopotamian goddess Atargatis transformed herself into a mermaid, after she accidentally killed her human lover.

Media
Mermaids appear in the following media:

Films

 * The Little Mermaid (1989) - a Walt Disney Feature Animation film, based on the story written by Hans Christian Andersen.
 * Splash (1984) - an american romantic fantasy comedy film starring Tom Hanks, Daryl Hannah, Eugene Levy, John Candy etc.
 * Mermaids: The Body Found (2016) - a TV mockumentary
 * Peter Pan - the movie adaptation from James M. Barrie's book, by Disney from 1953.

Books

 * Den lille havfrue (The little Meremaid) - a fairy tale written by the Danish author Hans Christian Andersen. It was first published in 1837.
 * Peter Pan - a story by James Matthew Barrie from 1911

Games
Lamia (in The Witcher) are similar creatures, although described as half woman and half snake.
 * Khimera: Destroy All Monster Girls
 * Might & Magic X: Legacy
 * The Witcher - those Water nymphs or Vila are beautiful female creatures, whom derive from slavonic mythology. Thoughout the series, there are many different water nymphs, but the Lady of the Lake probably is the most impressive and powerful. It's not proven, if she is just a local goddess or maybe more. While those Water Nymphs live near lakes, rivers or ponds, they still have legs and no fish tail. In The Witcher III - Wild Hunt, the Witcher also encounters various hostile Sirens, which not only have a fish tail (while looking like women from head down til the belly button), but also wings. Notable is Sh'eenaz, a mermaid from the Witcher Short Story "A Little Sacrifice" from the Sword of Destiny collection by Andrzej Sapkowski.
 * Might & Magic X: Legacy
 * The Witcher - those Water nymphs or Vila are beautiful female creatures, whom derive from slavonic mythology. Thoughout the series, there are many different water nymphs, but the Lady of the Lake probably is the most impressive and powerful. It's not proven, if she is just a local goddess or maybe more. While those Water Nymphs live near lakes, rivers or ponds, they still have legs and no fish tail. In The Witcher III - Wild Hunt, the Witcher also encounters various hostile Sirens, which not only have a fish tail (while looking like women from head down til the belly button), but also wings. Notable is Sh'eenaz, a mermaid from the Witcher Short Story "A Little Sacrifice" from the Sword of Destiny collection by Andrzej Sapkowski.
 * The Witcher - those Water nymphs or Vila are beautiful female creatures, whom derive from slavonic mythology. Thoughout the series, there are many different water nymphs, but the Lady of the Lake probably is the most impressive and powerful. It's not proven, if she is just a local goddess or maybe more. While those Water Nymphs live near lakes, rivers or ponds, they still have legs and no fish tail. In The Witcher III - Wild Hunt, the Witcher also encounters various hostile Sirens, which not only have a fish tail (while looking like women from head down til the belly button), but also wings. Notable is Sh'eenaz, a mermaid from the Witcher Short Story "A Little Sacrifice" from the Sword of Destiny collection by Andrzej Sapkowski.
 * The Witcher - those Water nymphs or Vila are beautiful female creatures, whom derive from slavonic mythology. Thoughout the series, there are many different water nymphs, but the Lady of the Lake probably is the most impressive and powerful. It's not proven, if she is just a local goddess or maybe more. While those Water Nymphs live near lakes, rivers or ponds, they still have legs and no fish tail. In The Witcher III - Wild Hunt, the Witcher also encounters various hostile Sirens, which not only have a fish tail (while looking like women from head down til the belly button), but also wings. Notable is Sh'eenaz, a mermaid from the Witcher Short Story "A Little Sacrifice" from the Sword of Destiny collection by Andrzej Sapkowski.
 * The Witcher - those Water nymphs or Vila are beautiful female creatures, whom derive from slavonic mythology. Thoughout the series, there are many different water nymphs, but the Lady of the Lake probably is the most impressive and powerful. It's not proven, if she is just a local goddess or maybe more. While those Water Nymphs live near lakes, rivers or ponds, they still have legs and no fish tail. In The Witcher III - Wild Hunt, the Witcher also encounters various hostile Sirens, which not only have a fish tail (while looking like women from head down til the belly button), but also wings. Notable is Sh'eenaz, a mermaid from the Witcher Short Story "A Little Sacrifice" from the Sword of Destiny collection by Andrzej Sapkowski.