Here is some new information from old Celtic Monthly sourced above that has an Irish flavor. Used were some online translations to give some idea of the meaning. Needs someone familiar with Gaelic to help with it. Needs to be sourced.
Aillean was Fearchar's mother, “nighean righ Mhanainn,”
Aillean means beautiful like a flower defined in text.
Nighean means daughter of.
Mhanain is Irish for of Man in an online Irish translation. https://www.google.com/search?rlz=1CASICM_enUS886&sxsrf=ACYBGNQ...
Righ in Irish means King in an online translation from Irish.
https://www.google.com/search?q=irisg+to+english&rlz=1CASICM_en...
Fhearchair mhic Airt mhic Aillinn.
Mhic is son of in early Irish.
Airt in Gaelic means Aird. That's a familiar word.
https://www.google.com/search?rlz=1CASICM_enUS886&sxsrf=ACYBGNR...
Aillin is the name of a mythical character who burned the Hill of Tarah in Ireland. Tarah was associated with the Applecross Abbots who started in Ireland...the "O" in the name on the maternal side.
https://en.wikipedia.org/wiki/Aillen