In The Scottish Highlands area there are a faction of spectral monsters from the folk traditions of the. Taking a range of forms, Fuath (or Fuathann) live close to Lochs Rivers and open seas, indicating that they are mainly water monsters. They are occasionally known as the Arrachd (or Fuath-arrachd). A Fuath is the monster of the Brollachan, a malevolent creature that were known to attacking children. The name Fuath translates as “hatred” or “aversion” in Scots Gaelic or “hate” or “likeness” in old Irish.
John and Caitlin Matthews, The Element Encyclopaedia of Magical Creatures, 2013, Fuath, p 184