Non common boy names

Serenity • 25 married to a wonderful hard headed man have two handsome sons a beautiful angel baby and a miracle rainbow
My husband and I found out we are having another boy and I absolutely DESPISE common names. My husband's name is Joseph mine is Serenity and both are common. And with our first son we named him Apostolos Alexion. Which mean messanger of light and protector of man. I really want Greek names but find it hard. Any ladies got any ideas? I'm thing in Aricles