Indeed Sigurd, there are two branches of Celtic languages: one (Bryttonic) gave birth to Welsh, Cornish, Devonian and Breton. The other (Goidelic) gave birth to Irish Gaelic, Scottish Gaelic and Manx and various northern dialects.
The reason for this is that the Indo-European consonant written as "qu" has given 'c' in the Gaelic (Goidelic) languages and 'p' in the Bryttonic languages.
For instance:
"head" in Irish is "ceann", in Welsh - "pen".
"who" - in Irish "ce", in Welsh "pwy".
These languages are among oldest surving languages still spoken in Europe today.
Bookmarks