Cylas is a modern respelling of Silas, a New Testament name that is usually traced to the Latin Silvanus, "of the forest", or to an Aramaic form of Saul, "asked for". The C spelling matches names like Cyrus and gives the biblical classic a sharper look. Cylas has never reached the US top 1000: it peaked at number 1898 in 2015 and ranks 2188 in 2025 with 65 boys given the name.