The etymology of Skye attempts to understand the derivation of the name of the Isle of Skye in the Inner Hebrides of Scotland. Skye's history includes the influence of Gaelic, Norse and English speaking peoples, and the relationships between their names for the island are not straightforward.
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The Gaelic name for the "Isle of Skye" is An t-Eilean Sgitheanach. The meaning of this name is not clear. Various etymologies have been proposed, such as the "winged isle" or "the notched isle" but no definitive solution has been found to date and the placename may be from a substratum language and simply opaque. For example, writing in 1549, Donald Munro, High Dean of the Isles wrote: "This Ile is callit Ellan Skiannach in Irish, that is to say in Inglish the wyngit Ile, be reason it has mony wyngis and pointis lyand furth fra it, throw the dividing of thir foirsaid Lochis". This was by no means the first written reference. Roman sources refer to the Scitis and Scetis can be found on a map by Ptolemy. A possible derivation from *skitis, an early Celtic word for "winged", which may describe the island's peninsulas that radiate out from a mountainous centre, has also been suggested. , coloured red on this map of western Scotland. In the Norse sagas Skye is called Skíð, for example in the Hákonar saga Hákonarsonar, and in a skaldic poem in Saga Magnús konungs berfœtts in the Heimskringla from c. 1230. According to other authors, it was referred to in Norse as skuy "misty isle", *skýey, or skuyö "cloud isle". It is not certain whether the Gaelic poetic name for the island, Eilean a' Cheò "isle of the mist" precedes or postdates the Norse name. Some legends also associatethe isle with the mythic figure of Queen Scáthach. The problems with the proposed Gaelic etymologies can be summed up as follows. Firstly, the Gaelic word for "winged" is sgiathach and sgiathanach is not attested in Gaelic except in the place name and the ethnonymSgiathanach "person from Skye". Secondly, the recorded pronunciations all point towards a clear preceding the -ach ending: ,, or. This means the form Sgiathanach is very unlikely to be based on the Gaelic plural of "wing", which contains a schwa in the last syllable and would represent a highly unusual adjectival form based on a plural noun. Thirdly, the diminutive/nominaliser ending -an would result in, with a clear in the last syllable. This form sciathán or sgiathan is indeed attested in the modern Gaelic languages. The Old Irishattested form is scíath with a reconstructed Celtic form *skeito-, which suggests the Irish form sgiathán is an innovation and an unlikely root for Sgiathanach. Finally, deriving the name from Scáthach involves two main problems: there would be a case of unexplained palatalisation of to and an unexplained extra element -an-. The roots of the Roman and Greek forms, Scit- and Scet-, could be the root of Sgitheanach as they would regularly develop into Old Gaelic and be an entirely logical source for the attested Norse Skíð. It would also lead to modern Sgitheanach via a regular suffigation of -an and -ach to form an ethnonym and adjective. This would also explain the use of an apparent root form in An Cuan SgithThe Minch and the older Irish form of Scíth rather than the modern An tOileán Sgiathanach, for example: Do ṡiuḃal sé Scíṫ agus an dá Uiḃeast agus Beinn a’ Ṁaola... "He travelled Skye and the two Uists and Benbecula...". In this case the interpretation of the name as "winged" may simply be a case of folk etymology. In April 2007 it was reported in the media that the island's official name had been changed by the Highland Council to Eilean a' Cheò. However, the Council clarified that this name referred only to one of its 22 wards in the then impending election, and that there were no plans to change signage or discontinue the English name.
