Sadie originates in Hebrew language and means "princess, lady-like". It is a diminutive of the name Sarah. In the Bible, Sarah was the wife of Abraham and the mother of Isaac. She was described as a woman of great beauty. She is also an important person in the Koran and an honored woman in the Islamic faith. The name became popular in the 17th century and has been popular ever since. Sadie functions as a surname as well.