It is almost entirely made up, which makes it a complete story. :')
Oh, those awful patriarchal societies just arose from nowhere (after 100s of 1000s of years of human prehistory) and oppressed the kindly, peaceful Great Goddess worshippers, who then, regretfully, had to arm themselves in self defense.
IOW, what a load of manure.
The place we know today as Ireland was called Scota by the first literate Celts from Galicia (in NW Spain) circa 700 B.C.. That name was moved to Alba in the 700 A.D. to 900 A.D. by Irish then conquering and colonizing what they called Scotia.
Later on, the Brits renamed Acadia as Nova Scotia in the mid 1700s.
Scota was renamed Ireland in honor of Ir, one of the "three brothers" who conquered Ireland.
If you ever wondered where that "we are descended from three brothers" stuff came from, this is the oldest story I could find.
The earliest Iriquoian stories focus on three brothers or cousins who are taken up in the sky by a prophet or shaman. They descend into different places ~ one to the North, one to the South, and one in between, to bring religion to human beings.
This is identical to a Gypsy story with origins in Bulgaria in the early 1400s.
"Mil" is also a Slavic rootword meaning "love". It's connection to "man" is pretty obvious.