Libby is a feminine given name, typically a diminutive form of Elizabeth, which is less commonly spelled 'Libbie' or 'Libi'. In recent years, it has been used as a shortened version of the name Liberty. The name means 'my heart' in Hebrew. It 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'.