RhymeZone: abby definitions

Definitions of Abby:

name: A female given name (rare: 1 in 6250 females; popularity rank in the U.S.: #694)
name: A surname (very rare: popularity rank in the U.S.: #53208)

noun: A diminutive of the female given name Abigail, from Hebrew, also used as a formal given name.
noun: A diminutive of the male given name Albert, from the Germanic languages
noun: Obsolete spelling of abbey [The office or dominion of an abbot or abbess.]

(Definitions from Wiktionary)