Libby is a feminine given name, originally a medieval diminutive of Ibb, which itself is a diminutive of Isabel. It is also used as a diminutive of Elizabeth. In recent years, it has been used as a shortened version of the name Liberty. The name means 'my heart' in Hebrew and gained popularity in Israel due to a character in a series of novels for young teenagers by author Hadas Leibowitz and its use in the Israeli song 'Achoti Haktana' or 'My Little Sister'.