Papandreou (Greek: Παπανδρέου) is a Greek surname. It is the surname of:
Etymology. Probably borrowed from Ecclesiastical Latin papas, from Ancient Greek πάπας (pápas, “bishop, patriarch”), variant of πάππας (páppas, “father”). Andreou (Greek: Ανδρέου [an̪ˈðre̞u]), also spelt Antreou, is a common surname in Greece and Cyprus. It originally meant son of Andrew or son of Andreas. Andreou or Andreu is also a last name in Spain and Italy. Andreou is of pre-Christian Greek origin although in Western Europe it gained popularity during the Crusades (mostly in the form of Andrew) and was also one of the earliest settler names in America.