The brain storm

I had a brain storm with lots of lightening and thunder. Which caused me to think this Suí mé anseo wondering nuair a cheannaigh roinnt daoine a n-intinn. Cosúil nuair a bhíonn siad nuair a rith amach inchinn cheap siad a dúirt siad traenacha agus chaill siad inniúlacht siúd. I do not think in Irish, Welsh yes but not Irish! I know that Celtic origins Irish Gaelic, Scottish Gaelic, Manx, Welsh, Breton and Cornish are all from the same root language, but Irish is Goidelic (Gaelic) and Welsh is Brythonic.
The Gaelic language was spread from Ireland to the Isle of Man and Scotland by migrating groups and raiders sometime from the 3rd Century on. While there are still huge similarities between the languages, they have all evolved in their own way.
The word Brythonic comes from a Welsh word Brython, which means an indigenous Briton, as opposed to Anglo-Saxon or Gael. The Brythonic languages derived from a British language spoken during the Iron Age. Within Britain several languages developed from this over the centuries including Welsh and Cornish. Breton in Northern France emerged as the Brythonic language was taken there by emigrating Britons.
In any case I found it strange to think in Irish a Q-Celtic Language instead of a P-Celtic Language like Welsh.