Gaels  

"Croker's book opened a new world of romance, and introduced the English reader to novel varieties of elf creatures, with outlandish Gaelic names; the Shefro; the Boggart; the Phooka, or horse-fiend; the Banshee, a familiar spirit which moans outside the door when a death impends; the Cluricaune, or cellar goblin; the Fir Darrig (Red Man); the Dullahan, or Headless Horseman."--A History of English Romanticism in the Nineteenth Century (1899) by Henry Augustin Beers