CФPAГ(IC) MAPIAC MO.AXIC THC EYГENECTATIC APXONTICIC (A.V. Soloviev, 'Marie fille de Constantin IX Monomarque', Byzantion, 33, 1963 [reprinted in Byzance et la formation de l'Etat Russe, London, 1970, no. 6]). Unfortunately, I have not been able to see this article for myself, only seeing the inscription cited in various books.
From what I can tell, this inscription names her as Maria. Other than that, I have been unable to decipher this inscription and I can't seem to locate the original (French language) article to see what it translates it as.