Cyrus \cy-rus\ as a boy's name is pronounced SY-russ. It is of Persian origin. Derived via the Greek form Kyros of the name of several kings of Persia. In earlier times, it was linked with Greek "kyrios" meaning "lord". Historical: Cyrus the Great (fifth century BC) conquered Babylon at the height of its powers and founded the Persian Empire. Biblical: Cyrus is prophetically named in the book of Isaiah as the one who would overthrow Babylon and liberate the captive Israelites. Also the name of a fourth-century saint, a doctor in Alexandria. Inventor Cyrus McCormick; former Secretary of State Cyrus Vance.
For more information, see also the related name Tyrus.