The Gaels or Goidels are speakers of one of the Goidelic Celtic languages: Irish, Scottish Gaelic and Manx. Goidelic speech originated in Ireland and subsequently spread to western and northern Scotland and the Isle of Man.
The modern English term Gael derives ultimately from the Old Irish (Ancient Gaelic) word Goídel, which was spelled in various ways by Gaelic writers at different times. The modern Gaelic spellings are Gael (Irish) and Gàidheal (Scottish Gaelic).
Early Greek and Roman authors called the Irish Ιουερνοι and Iverni, respectively, both derived from the Proto-Irish ethnic name *Iwerni ("people of *Iweriū"). Later Greek and Latin variants of this name included Ίερνοι, Hierni, and Hiberni.
Scoti or Scotti was another generic Latin name for the Irish that came into use by the 4th century. It is not believed that any Gaelic groups called themselves Scot(t)i in ancient times, except when referring to themselves in Latin. It is also conjectured that the Latin term may mean "raider/pirate" as it is widely accepted that raiders from Ireland were attacking Britain's west coast during and following the Roman occupation.
Goidel is thought to have been borrowed some time during the 7th century from the (not directly attested) Primitive Welsh form which became Old Welsh Guoidel, i.e. "Irishman" (which is attested as a male personal name in the Book of Llandaff), and may ultimately be derived from the Proto-Indo-European *weidh-(e)l-o-, perhaps meaning "forest people", partially cognate with the Old Irish ethnic name Féni (from Proto-Indo-European *weidh-n-jo-, "forest people", later becoming simply "warriors" in Proto-Irish).
History of use 
Since the disappearance of Gaelic as a community language in the south and east of Scotland in the late medieval period, and the popularity of the terms 'highland Scot' and 'lowland Scot', the term Gàidheal has been used in Gaelic language conversation not merely to denote Gaelic identity but also as an equivalent for the single English word 'highlander'.
Up until the late 15th century, the Gaelic language in Scotland was generally named Scottish, both in its Latin form and in Early Scots. For example, the usage in The Flyting of Dumbar and Kennedie at the start of the 16th century is Erse (= Irish) and Inglis (= English). After this time, the Gaelic language generally became called Erse (Irish) and the lowland tongue Scots (= Scottish).
Documentary evidence shows other subsequent alterations in general terminology, such as the appearance of the Latin term "Scotos Hibernicos" in 1521 and its English equivalent, "Scottish-Irish", by the English diplomat Ralph Sadler in 1558 to refer to Scottish Gaels.
In the earliest surviving writings in the Lowland Scots language (which had hitherto been called Inglis), a form of the term Gaidheal appears to discriminate between Gaels from the Scottish Highlands and Gaels from Ireland. In 1596, it appears in James Dalrymple's translation from Latin into Lowland Scots of the Historie and Chronicles of Scotland, 1436–1565 as the main element within the word Gaelic, referring to the language in Scotland, rather than in Ireland.
Current definitions 
- Gaels – the ethno-linguistic group
- Gaelic – of or relating to the Gaels
- Goidels – an alternative term sometimes used to describe the Gaels in antiquarian contexts
- Goidelic – of or relating to the Gaels, particularly their language, in antiquarian contexts
Gaelic culture and society 
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Mythological origins 
The Gaels, during the beginning of the Christian era, believed themselves to be descendants of the Milesians - the sons of Míl Espáine. Much of this is covered in the Lebor Gabála Érenn, which catalogues the Milesian invasion of Ireland from the Iberian Peninsula. While this account is mostly mythical, it may be an embellished version of actual historical events. Recent genetic studies by Brian Sykes of Oxford University suggest that these myths are based on historical facts since the people of northwestern Iberia, especially those from Galicia and Asturias are genetically closely related to the Gaels.
Emergence of Gaelic language 
Estimates of the arrival of proto-Gaelic in Ireland vary widely from the introduction of agriculture circa 7000-6000 BC to around the first few centuries BC. Little can be said with certainty, as the language now known as Old Irish, ancestral to modern Irish, Scots Gaelic and Manx, first began to be properly recorded with the Christianisation of Ireland in the 4th century, after the introduction of the Roman script. Old Irish does appear in a specialized written form, using a unique script known as Ogham. The oldest examples of Ogham have survived in the form of memorial inscriptions or short epitaphs on pillar-like stone monuments (see Mac Cairthinn mac Coelboth.) Ogham stones are found throughout Ireland as well as in other areas where Gaelic invaders settled across post-Roman Britain. This form of written Old Irish is thought to have been in use as early as 1000 BC. The script frequently encodes a name or description of the owner and surrounding region, and it is possible that the inscribed stones may have represented territorial claims.
In the 5th century, the Gaelic kingdom of Dál Riata emerged on the west coast of Scotland. It has long been held that Dál Riata, and Gaelic language in Scotland, came about due to a migration and/or hostile conquest from Ireland. However, some archeologists now argue against this, saying that there is no archeological or placename evidence for it. Gaelic language and culture soon spread to most of the rest of Scotland and eventually became the dominant one. This led to the Latin name for Gaelic speaking peoples, "Scoti," being applied to the state founded by the Gaels: "Scotland". Since that time Gaelic language rose and, in the past three centuries, greatly diminished, in most of Ireland and Scotland. The most culturally and linguistically Gaelic regions are in the north west of Scotland, the west of Ireland and Cape Breton Island in Nova Scotia where the descendants of the Highland Clearances were transplanted
The Isle of Man (Manx: Ellan Vannin, 'Mannin's Isle', from the pre-Christian deity known as Manannán mac Lír) also came under massive Gaelic influence in its history. The last native speaker of Manx died in the 1970s, though use of the Manx language never fully ceased. There is now a resurgent language movement and Manx is once again taught in all schools as a second language and in some as a first language. A large part of the island's cultural heritage is Gaelic.
The two comparatively "major" Gaelic nations in the modern era are Ireland (which in the 2002 census had 185,838 people who spoke Irish "daily" and 1,570,894 who were "able" to speak it) and Scotland (58,552 "Gaelic speakers" and 92,400 with "some Gaelic language ability" in the 2001 census). Learning Irish Gaelic is compulsory in Republic of Ireland schools; learning Scottish Gaelic is not compulsory in Scotland. Communities where the languages are is still spoken natively are restricted largely to the west coast of each country and especially the Hebrides in Scotland. However, a large proportion of the Gaelic speaking population now lives in the cities of Glasgow and Edinburgh in Scotland, and Donegal, Galway, Cork and Dublin in Ireland. There are about 2,000 Scottish Gaelic speakers in Canada (Canadian Gaelic dialect), although many are elderly and concentrated in Nova Scotia and Cape Breton Island. According to the PDF (123 KiB), there are over 25,000 Irish-speakers in the United States with the majority found in urban areas with large Irish-American communities such as Boston, New York City and Chicago.
See also 
- "Gael" is often used specifically for Scottish Gaelic speakers. "Goidels" was advanced by John Rhys in Early Britain (1882) as a blanket term for all speakers of a Goidelic tongue, and has been used commonly in Celtic studies. See "Goidel". Oxford English Dictionary. December 1989. Retrieved April 14, 2010..
- Koch, John (ed). Celtic Culture: a historical encyclopedia, ABC-CLIO, 2006, pp. 709-710; p. 846; p. 848
- Online Etymology Dictionary: "Scot"
- Koch, John (ed). Celtic Culture: a historical encyclopedia, ABC-CLIO, 2006, p. 846
- Koch, John. The Goddodin of Aneirin, Celtic Studies Publications, 1997, pg. xcvii, note 2)
- Koch, John (ed). Celtic Culture: a historical encyclopedia, ABC-CLIO, 2006, p. 739
- Campbell, Ewan. "Were the Scots Irish?" in Antiquity #75 (2001).
- Central Statistics Office Ireland - Irish ability, persons aged 3 years and over.
- General Register Office, Scotland's Census 2001, Gaelic Report
- Oifis Iomairtean na Gaidhlig/Office of Gaelic Affairs
- Aberdeen University Celtic Department Information and courses on all aspects of Celts, Gaels and related peoples, languages and cultures
- Iomairt Cholm Cille (The Columban Institute) An institute with the aim of promoting links between Irish and Scottish Gaelic speakers.
- DNA shows Scots and Irish should look to Spain for their ancestry