Basically, it’s legally impossible to get your husband’s last name in Greece, unless you have a good reason to file for a plea for it. It takes a lot of time and cost a lot of money and believe it or not, this is caused by a famous Greek politician’s ex-wife whose husband cheated and divorced her to marry a flight attendant.
Marriage institution is carefully protected and this makes Greece the country with the lowest divorce rate in Europe. People have to go through a lot of bureaucracy procedures and it’s really expensive. You also can’t ask for a divorcement within 6 months of your marriage. Family is important in Greece.