It maybe of interest to you that Mavreas as you called in is a Venetian name. Moro (Mauro). The family was everywhere in Greece, Governors in Cyprus, Doge in Venice, Counts in Candia. The Cretan version of the name is "Maureas" and it appears around 1500 in Chania, Crete. So, you can expect to find the name Mavreas (Maureas) on the west coast of Greece, from Peloponnese to Corfu.