Vasilis is a Greek masculine given name derived from the ancient Greek name Basileus, which means "king". It has been used extensively throughout Greece and Cyprus for centuries, contributing to its popularity in the Orthodox Christian world. Vasilis is often shortened to Vassi in familiar contexts. The name gained significant recognition internationally through notable figures such as Vasilis Tsitsanis, a prominent Greek rebetiko musician, and Vasilis Alexiadis, a renowned Greek Olympic champion gymnast.
The name Vasilis has seen fluctuating popularity over the years, with a noticeable decline since the early 2000s. The highest number of births recorded was 11 in 2000, while more recently, there have been five births each year from 2012 to 2021. Overall, Vasilis has been given to a total of 186 babies across these years.