Upvote:1
Probably the only entities capable of figuring out the span and frequency of baptismal names, at least since September 1st, 1979 (a liturgical new year), are the Registry Department of each Archdiocese. You could try contacting them individually, although it's possible that their records are not digitized, in which case it would take a lot of effort to figure out your question. My modern Greek is only elementary, I am not sure if this is true outside of the Greek Orthodox church in America, unfortunately.
As you may know, baptismal names are taken from the names of saints. Each saint has a day they're celebrated--often their date of martyrdom, if it is known. Therefore, calendars of "name days" will contain the names that are suitable for baptismal names. The two I have linked two are particular to Greek Orthodox saints. Of course, any Eastern Orthodox saint's name would be acceptable as a baptismal name, but each Patriarchate has its favorites!