The Goidelic languages are often referred to as “Q-Celtic” because they use a “Q” sound, usually represented by a C or K, where the Brythonic or “P-Celtic” languages use P. For instance, Irish and Scottish Gaelic for “head” is ceann, or sometimes kin. Brythonic languages, P-Celtic Welsh and Cornish, use pen. There’s a place on the coast of Cornwall called Pentire, and one on the coast of Scotland called Kintyre. Both mean “head of the land.” There are hundreds of similar P and C initial words that indicate the relationship between P-Celtic and Q-Celtic languages. In Celtic linguistics, it really pays to “mind your Ps and Qs.”