Celtic languages come from Proto-Celtic which is a supposed relative to the Celtic languages of Indo-European languages.
The places where the Celtic language is most commonly spoken are Wales, Scotland, Ireland, Cornwall and Isle of Man. However, the language is also spoken in Patagonia which is in Argentina and Chile and in Canada on Cape Breton Island.
In countries such as the United States, Canada, New Zealand and Australia the Celtic language is spoken mostly by minorities.
There are four sub-families of the Celtic language. The first is Gaulish, which is extinct but was spoken in areas of areas from France to Turkey as well as from Belgium to the northern areas of Italy.
Celtiberian another extinct form of Celtic language was spoken in areas of Old and New Castile in Spain, Southern Portugal and the Iberian peninsula.
Goidelic and Brythonic are still spoken in places such as Ireland, Scottish Gaelic, Manix, Welsh, Breton, Cornish and Cumbric.
Of the six existing Celtic languages four of them still have a significant number of people who speak some form of the Celtic language. Those four are the Welsh, Breton, Irish and Scottish Gaelic. The other two which are Cornish and Manix are only existing now due to some people who are trying to revive them.