The Georgetown Hoyas?

What in the world is a Hoya? Well, at one time, all students attending Georgetown were required to take courses in Greek and Latin. At that time, the sports teams from Georgetown were nicknamed “Stonewalls.” A student whose name has been lost to history, using Greek and Latin terms, started cheering for the teams by yelling “Hoya Saxa,” which translates into “What Rocks!” The cheer proved popular, was shortened to Hoyas and adopted as the official nickname for all Georgetown teams.

Source: Georgetown men’s basketball media guide