In English folklore, Puck ('pʌk), also known as Robin Goodfellow, is a domestic and nature sprite, demon, or fairy.
The etymology of puck is uncertain. The modern English word is attested already in Old English as puca (with a diminutive form pucel). Similar words are attested later in Old Norse (púki, with related forms including Old Swedish puke, Icelandic púki, and Frisian puk) but also in the Celtic languages (Welsh pwca, Cornish bucca and Irish púca). Most commentators think that the word was borrowed from one of these neighbouring north-west European languages into the others, but it is not certain in what direction the borrowing went, and all vectors have been proposed by scholars. The Oxford English Dictionary favoured a Scandinavian origin, while the scholarly study by Erin Sebo of Flinders University argues for an Irish origin, on the basis that the word is widely distributed in Irish place-names, whereas puck-place-names in English are rare and late in the areas showing Old Norse influence, and seem rather to radiate outwards from the south-west of England, which she argues had Irish influence during the early medieval period.
Puck may also be called Robin Goodfellow or Hobgoblin, in which Hob may substitute for Rob or Robin. The name Robin is Middle English in origin, deriving from Old French Robin, the pet form for the name Robert. Similar to the use of "the good folk" in describing fairies, it reflected a degree of wishful thinking and an attempt to appease the fairies, recognizing their fondness of flattery despite their mischievous nature.
The earliest reference to "Robin Goodfellow" cited by the Oxford English Dictionary is from 1531. Anthony Munday mentions Robin Goodfellow in his play The Two Italian Gentlemen, 1584, and he appears in Skialtheia, or a Shadowe of Truth in 1598. William Shakespeare may have had access to the manuscript of Lewes Lewkenor's translation of The Spanish Mandevile of Miracles, or, The Garden of Curious Flowers (1600), a translation of Antonio de Torquemada's Jardín de Flores Curiosas.