Ciro is the Italian and Spanish form of Cyrus, the name of the Persian king who founded the Achaemenid Empire in the 6th century BC; its Old Persian meaning is uncertain and is usually explained as "sun" or "lord". In southern Italy the name honors Saint Cyrus, a physician martyred in Alexandria who is the patron of several towns around Naples. In the United States Ciro stood at number 2631 in 2000, reached number 2378 in 2024 and ranks number 2894 in 2025 with 43 births.