Belonging to Greek origins, the meaning of Vasilis is 'kingly', 'royal', 'monarch-like,' and is a name considered by parents looking for names for a baby boy. In medieval times, it is also transliterated as Basileios. This is the Greek version of the name Basil, meaning 'royal'. It directly comes from the word 'king'. A popular nickname for people with the name Vasilis is Vaso.