What kind of name is Demetriou?

"The Hamilton Mixtape: Immigrants (We Get The Job Done)"

HamiltonMusical 

https://youtube.com/watch?v=6_35a7sn6ds&si=IpEe4zvpCaZEoXGy

"Steven J. Demetriou, Executive Chair..."

https://www.reddit.com/r/Fauxmoi/s/iGPi4UOJFb