Meaning and origin of Abby

The boy's and girl's name Abby \a(b)-by\ is a variant of Abbey, Abbott, Abelard and Abner.
The baby name Abby sounds like Abbe, Abba, Abey and Ebby. Other similar baby names are Alby and Amby.
Abby is a very rare male first name and a common surname (source: 1990 U.S. Census).
-http://www.thinkbabynames.com/