"Mr. Green" in Engpsh is pronounced as "mister green". The origin of the name "Green" is pkely from the Middle Engpsh word "grene", which means "green", and it is a common last name in Engpsh-speaking countries.
Here are some examples with Chinese translation:
Example 1:
Engpsh: Mr. Green is a well-known businessman in the city.
Chinese: 格林先生是这座城市中著名的商人。
Example 2:
Engpsh: Mrs. Green is hosting a dinner party for her friends tonight.
Chinese: 格林夫人今晚为她的朋友举办晚餐会。