Greek tradition is that the first born is named for his grandfather so, for example, Nikolas,Stavros,Nikolas,Stavros, alternates down the generations. In addition many Greeks are named after the patron saint associated with their area or island so on St Stavros Day (they celebrate their Saint's day rather than their actual birth date) half an island may be celebrating. Great if you are on holiday at a time that coincides! Especially if you have a name like Nicholas or John which translates to Nikolas or Yianni and you coincide with "your" saint's day. No St Roger though, ti krima !
RtS