Libby is also a diminutive of the English name Liberty.
― Anonymous User 2/20/2023
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Libby is also nickname for Libuscha, Libusha, Libjena and Libena.
― Anonymous User 6/9/2011
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Originally Libby was derived from "Ibb" - a pet form of Isabel, another form of Elizabeth. That explains the "ibby" sound in it, which is not heard in the name "Elizabeth" and which might otherwise seem inexplicable.Ibb has been used since the Middle Ages, so this seemingly modern-sounding name actually has quite a long history. [noted -ed]