Efstathiou Surname Meaning

The Greek surname Efstathiou (Ευσταθίου) is a patronymic name, meaning it is derived from the given name of a male ancestor. The root Efstathi- comes from the first name Efstathios (Ευστάθιος), which originates from the Ancient Greek word eustáthios, meaning “steadfast,” “stable,” or “well grounded,” formed from eu (“well”) and státhios (“standing”). This name conveyed reliability and moral firmness and became widely used in Greek society through early Christian tradition and saints bearing the name. The suffix -ou is a genitive marker indicating descent or family association, meaning “of” or “belonging to.” Consequently, the surname Efstathiou signifies “the descendant of Efstathios” or, more literally, “of the steadfast one.”