I read one time that the word Scotch comes from the word Scyth. Don’t know if that is true, but if it is, it explains a few things.
Ireland was earlier called Scota. It was renamed Ireland after Ire, one of the three brothers who invaded in the 8th century BC.
BTW, that's according to Galician histories in Northern Spain. The English have a different take on the matter but who are they? They lived in a great big old sinking bog-land in Europe at the time!