Kirilas / Kirill / Cyril / Kyrylo

Kirilas is a Lithuanian and Russian form of the Greek name Kyrillos, which itself is derived from the Greek word 'kyrios' (κύριος), meaning 'lord' or 'master'. The name gained prominence through Saint Cyril of Jerusalem, a 4th-century bishop and theologian, and later through Saint Cyril, one of the apostles to the Slavs, who, along with his brother Methodius, created the Glagolitic alphabet, which later evolved into the Cyrillic alphabet. This association with Saint Cyril led to the name's widespread adoption in Eastern Orthodox Christian countries.

The name has been consistently used in Eastern European countries, particularly those with strong Orthodox traditions. Its meaning of 'lord' or 'master' has contributed to its dignified and respected perception. While less common in Western Europe, it remains a classic and traditional choice in its regions of origin, often associated with religious figures and historical significance.