How do you say caesarea in English?

"Caesarea" is already an English word. It can be pronounced in a few different ways, depending on the context and what you're referring to:

* Cæˈsɛəriə: This is the traditional pronunciation, often used for the ancient Roman city of Caesarea Maritima.

* siˈzɛəriən: This pronunciation is used when referring to the surgical procedure of Caesarean section.

It's best to use the pronunciation that fits the specific context you are using the word in.