Therefore, it can be asserted that the BlackIrish are the descendants of the Irish and Africans of Monserrat and also the offspring of the Basque people of Spain. However, all the theories are hotly contested among Historians except for the Montserrat theory. However, the actual origin of the term BlackIrish is still a hotly contested subject among many people.
https://myrealireland.com/irish-knowledge/what-is-the-meaning-of-black-irish/