sentences:  In modern practice he is called Giannis Eleftheriou, where Giannis is the popular form of the formal Ioannis but Eleftheriou is an archaic genitive.For women the surname is usually a Katharevousa genitive of a male name, whereas back in Byzantine times there were separate feminine forms of male surnames, such as "Palaiologína" for "Palaiológos" which nowadays would be "Palaiológou".In the past, women would change their surname on first marrying to that of their husband in the genitive case, so marking the change of dependence to husband from father.