Merrow, is the Gaelic equivalent to a mermaid, or merman of other cultures. Like popular belief they have a human torso, and fish tail. Their personalities are gentle, modest, benevolent, even affectionate.

The merrow are capable of inter-marrying with humans, and are sometimes reported to come ashore and live among humans for years, though most return back to their home beneath the sea.

Merrow-maidens as reputed for luring handsome young men to follow them beneath the waves where they live in an enchanted state. Merrows are said to wear a special hat called cohuleen druith, and if they lose it, they cannot return to the water. She has soft white webs between her fingers and is often seen with a comb parting he long green hair to either side.