Leo derived from Latin leo meaning "lion", a cognate of Leon. It was popular among early Christians and was the name of 13 popes, including Saint Leo the Great who asserted the dominance of the Roman bishops (the popes) over all others in the 5th century. It was also borne by six Byzantine emperors and five Armenian kings.
Saintly namesake: Pope Leo I, also known as Leo the Great, was a 5th-century pope renowned for his leadership and theological influence. He is one of several saints named Leo. (November 10 · 5th century)
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