From the Greek name Κυριλλος (Kyrillos)
which was derived from Greek κυριος (kyrios)
"lord", a word used frequently in the Greek Bible to refer to God or Jesus.
This name was borne by a number of important saints
, including Cyril of Jerusalem, a 4th-century bishop and Doctor of the Church, and Cyril of Alexandria, a 5th-century theologian. Another Saint Cyril was a 9th-century linguist and a Greek missionary to the Slavs. The Cyrillic alphabet, which is still used today, was created by him and his brother Methodius in order to translate the Bible into Slavic
, and thus this name has been especially popular in Eastern Christianity. It came into general use in England in the 19th century.