Celtic heritage is still celebrated in France, but Celtic speakers,
I don't think. The languages that Gweltas mentioned are "Insular
Celtic Languages", which originated in the British Isles. There are
also six Continential Celtic Languages, which originated in mainlaind
Europe. Continential Celtic Languages are now extinct, according to
what I have read.


The evidence stating that Gaelic was spoken long before the Scots
Dalriada is realistic.
The Celtic people were originally nomadic, travelling and establishing settlements throughout Europe before the Romans invaded. Inhabitants of Scotland and Ireland obviously would have known about each other, and occupied lands in each.
An example would be: The Druid religion, was also vibrant in the British Isles before Dalriada, and many of them in Scotland probably spoke Gaelic as well.