Save Gender Masculine Usage Irish (Latinized), Medieval Dutch, Dutch (Rare) Pronounced Pron. kee-lee-AH-nus(Medieval Dutch, Dutch) [key] Other Forms FormsCilianus Meaning & History Latinized form of Cillian via its variant form Kilian. When this given name first came into use in the Netherlands during the Middle Ages, it was given in honour of saint Kilian, who is generally known as sint Kilianus in Dutch.