Many American Universities include social organizations such as fraternities and sororities. These groups are named after Greek letters, a tradition that reportedly started with the Phi Beta Kappa Society at the College of William and Mary. That is because in the 18th and 19th Centuries, higher education in the United States focused on the study of Latin and Ancient Greek. Knowing Latin was a requirement to study in a University, whereas knowing Greek meant that you were very cultured and significantly increased someone’s chances of getting accepted.
The only difference is that ancient and biblical Greek -sometimes modern Greek as well- were taught with the Erasmian pronunciation, which is different than the native speakers’ pronunciation.
Here is how some sororities would sound like in Greek: