Merrow

Merrow (from Irish murúch, Middle Irish murdúchann or murdúchu) is an Irish-English term for a mermaid or merman.
The word appears in two tales set in Ireland published in the 19th century. In Lady of Gollerus, a green-haired beautiful merrow is forced to wed a local Kerry man who deprives her of the "magical cap" (cohuleen druith). And in the The Soul Cages a green-bodied grotesque male merrow entertains a fisherman at his home, displaying a collection of castaway human souls.