A Reply from Sean Murphy
There does not appear to be any record of an historical Marmion chiefship, and the name is of Norman origin, although sometimes used as a synonym of Merriman. It is my opinion that most of the claims to Irish chiefship made in the last few decades are questionable to say the least: (see http://homepage.eircom.net/%7Eseanjmurphy/chiefs/chiefswatch.htm).
Sean Murphy






Reply from The Chief Herald, Mr Fergus Gillespie:

No one of the name Marmion has ever been recognised by the Chief Herald of Ireland as a clan chief .  We have no knowledge of any claim to such a style.
Fergus Gillespie
Príomh-Aralt na hÉireann
Chief Herald of Ireland.