The "Byzantine Empire" Instead Of "Constintine Empire"?

Why isn’t the Byzantine Empire called the Constintine Empire instead? After Constantine changed the name of the city from Byzantium to Constantinopolis - it remained that way for 1600 years. I would imagine that the empire would be called the Constintine Empire instead of the Byzantine - a name that predated the actual empire entirely.

Any nobody living in the Byzantine Empire called it that. It was simply the “Roman Empire”. In Western Europe it was sometimes called the Greek Empire.

But why is is called the Byzantine Empire now?

Because, before the city was named Constantinople, it was a smaller town named Byzantium, hence the name “Byzantine”.

It was a convention adopted in the 18th and 19th Centuries, most likely to indicate the basically Greek nature of the empire (Byzantium being the Greek name).

From here