From Κυρος (Kyros), the Greek form of the Persian name Kūrush, which may mean "far sighted" or "young". The name is sometimes associated with Greek κυριος (kyrios) "lord". It was borne by several kings of Persia, including Cyrus the Great, who conquered Babylon. He is famous in the Old Testament for freeing the captive Jews and allowing them to return to Israel. As an English name, it first came into use among the Puritans after the Protestant Reformation.