More commonly used now as a diminutive of Elizabeth, Libby was originally a medieval diminutive of Ibb, which itself was a diminutive of Isabel. Both Elizabeth and Isabel can be traced to the Greek name Elisabet (Ἐλισάβετ), itself derived from the Hebrew name Elisheva ,referring to the Hebrew God ,) ֵאל( meaning "my God is an oath," from the elements el ,) ֱא ִלי ֶשׁ ַבע( and shava (ָשׁ ַבע ), meaning "oath". Its popularity as a stand-alone name peaked in the early 2000s and has been on the decline since.