If you want to talk originally the Scots are as Celtic as can be. They were Gaels and were the last Celtic tribe who were in northern Ireland before they set up the kingdom of Dal Riata in SW scotland. Both Irish Book of Invasions and the Scottish origin has them dwelling in Spain before coming to Ireland. And that history has been called just a myth. But haha look at history and the genomes It starts to become true scripture. The Scots even attribute origin to greater Scythia which can't even be refuted anymore, the proof is in the pudding. The thing.