Galwegian Gaelic
George Buchanan, himself a Gaelic speaker, writing in 1575, reported that Gaelic was still spoken in Galloway. In the middle of the century, 1563–1566, an anonymous English military investigator reported that the people of Carrick "for the most part specke erishe".
Celts (modern)
It is these six nations that (alone) are considered Celtic by the Celtic League and the Celtic Congress amongst others. These organisations ascribe to a definition of Celticity based mainly upon language. In the aforementioned six regions, Celtic languages have survived and continue to be used to varying degrees in Ireland, Scotland, Wales, Isle of Man, Cornwall and Brittany. There are also Celtic nomads: Irish Travellers called "Pavee" that speak a language called Shelta that is a creole of Irish Gaelic and other languages and Indigenous Highland Scottish Travellers called "Tinkers" who speak a language called Beurla Reagaird that is an acrolect of Scottish Gaelic.