Vassiliou is a Greek surname, an alternate transcription of Βασιλείου (see Vasiliou). It is a patronymic surname derived from the given name Vasilios (in turn the modern Greek form of Basil 1), and essentially means “son of Vasilios.” The root name Basil 1 comes from the Greek βασιλεύς (basileus), meaning “king,” and the derived adjective βασίλειος (Basileios) means “royal” or “kingly.” Historical and Cultural Background The name Basil the Great, a 4th-century bishop of Caesarea and a prominent father of the early Christian church, helped popularize the name across the Christian world, especially among Eastern Christians. This contributed to the widespread use of Vasilios and its patronymic forms like Vassiliou. The name was also borne by two Byzantine emperors: Basil I (founder of the Macedonian dynasty) and Basil II (known as the “Bulgar-Slayer”). Due to this royal and ecclesiastical prestige, the surname Vassiliou is common in Greece and Cyprus. Notable Bearers The surname and its variants appear among many notable individuals. Prominent figures with the spelling Vassiliou include: Androulla Vassiliou (born 1943), Cypriot politician and European Commissioner. George Vassiliou (1931–2026), the third President of Cyprus (1988–1993). Markos Vassiliou (born 1983), Greek musician and composer. Spyros Vassiliou (1902–1985), acclaimed Greek painter and engraver. Fofi Gennimata (born Vassiliou, then Gennimata; 1964–2021), Greek politician and leader of the Panhellenic Socialist Movement (PASOK). Notable bearers with the Vasileiou/Vasiliou spelling include Alexandros Vasileiou (merchant and scholar), Eleni Vasileiou (basketball player), and Giorgos Vasiliou (actor and footballer). Variants and Related Names The surname appears in several forms, reflecting regional and transcriptional differences: Vasiliou, Vasileiou (common in Greece), and Vassiliou (especially in Cyprus). In other languages, equivalent patronymic surnames exist: Bulgarian Vasilev and Vasileva, Lithuanian Vasiliauskas, Vasiliauskienė, and Vasiliauskaitė, and Italian Basile (itself sometimes used as a given name). Distribution While most heavily concentrated in Greece and Cyprus, the surname appears among Greek diaspora communities worldwide. Meaning: “son of Vasilios” (from Greek “kingly”) Origin: Greek Type: Patronymic surname Usage regions: Greece, Cyprus, Greek diaspora