Hello, I have some information that may be useful. I once had a long term relationship with someone with the Vlahos surname. I actually went to Greece to visit the family and found out that the name Vlahos actually "Vlachos" means Shepheard. Or one who attends to Sheep. For a woman, the name in Greece actually changes to Vlahou. You may do some research into posting international messages to find out more about the Greek origins. I can tell you that there are Vlahos families in Kallitechnoupoli Greece and in Agia Paraskevi. Should this info help, let me know.
Jesus