Andy Howey wrote:

> Gaelic, Scots-Gaelic, and Manx form the Goidelic branch of the Celtic
> language family. Welsh, Breton, and Cornish form the Brythonic branch
> of the Celtic language family.

The last mother-tongue speaker of Manx died in the 1970's and of Cornish
in the late 19th century. There are attempts to revive Cornish as an
everyday language through the efforts of Mebyon Kernow - a putative
"Cornish Nationalist" political organization.

Welsh remains vigourous with 500,000 speakers or about 20% of the Welsh
population. Irish Gaelic and Scots Gaelic have perhaps no more than
40,000 mother-tongue speakers each, though substantially more are fluent
in them as second languages, thanks to being taught in schools and a
positive attitude to them by government. There are no monolinguals and
regular everyday use is now confined to the remoter areas of W Ireland
and the NW islands of Scotland.

It's perhaps worth pointing out that Breton (as it's name implies) is an
import into NW France from Britain and has no relationship with the long
extinct continental Celtic languages such as Gaulish and Celtiberian.

Patrick