"True, they get the black hair from the Spanish invaders."
Shipwrecked Spaniards not invaders. The Spanish influence was the result of the distruction of the Spanish Fleet on the West Coast of Irland after their defeat during the Armada. They're the ancestors of the survivors are commonly called "Black Irish".
Oooops! Sorry, you are correct.
The presence of Mediterranean looking Irishmen and the genetic similarity of many Irish to the Basques represent settlement patterns that well predate the defeated Armada and even the birth of Christ. Ireland had inhabitants prior to the arrival of the Celts, who may have been akin to the Basques. Additionally, trade routes from the eastern Mediterranean extended into the British Isles, and Ireland was never out of touch with sailors, traders, and merchants from that area. These influences are more plausible explanations for the "Black Irish" than are Armada survivors.
One of my aunts had black hair and she was Norwegian. Mom always said she was like someone from Bergen, Norway. Is that true, Bergeners???