What is the nickname for Jacob and how is Jacob called familiarly?

== == Jacob is from the Bible and the nickname would be "Jake." People prefer short-forms of names sometimes. For instance my Christian name is Marcia, but I go by Marcy because some people are persistant on calling me "Marsha" which is an entirely different name and it bothered me. My girlfriend just became a grandmother and her grandson is named Jake.

Another nickname for Jacob would be, Jack Jack is often a nickname for John