Vasileios is a Greek masculine given name of ancient origin, deriving from the Greek word "vasileus" which translates to "king" or "ruler". The name was quite popular among the nobility and royalty in Byzantine Greece due to its regal connotation. In the modern era, Vasileios remains a widely used name in Greece, Cyprus, and other regions with significant Greek populations. It is often shortened to Vasilis in everyday use, but the full form Vasileios is typically preferred for formal or official purposes. The name does not have any specific feast days or associated saints, unlike many other Greek names which are often linked to religious figures or events.
"Vasileios is not commonly used as a baby name."