Steffi is a German diminutive of Stephanie. Stephanie originates in Greek language and means "woman with crown". That is certainly the reason why Stephanie has been one of the most popular names within royalty over centuries, the famous ones being Princess Stephanie of Belgium and Princess Stephanie of Monaco. Stephanie is also the name of an Eastern Orthodox virgin martyr and saint. As a feminine given name, Stephanie remains popular until today, not only in the United States.