Liar, Liar, Pants on fire

Tuesday there was this super old lady at the church. It was her first time there so i took advantage of the fact she had never met me and did the unthinkable. I lied. I easily convinced her that my name was Jebedaih Cordas or Jab for short. She completely bought it and for the rest of the day I got everyone to call me Jab.

So my new name is Jab.
My issue is that I need a backround story to where I got the name from. Any ideas???