What Was Abraham’s Last Name?

This one comes courtesy of my 6 year old grandson, Heath.  The other night his mother (my daughter, Leah) was reading the boys a Bible story at bedtime.  This particular night it was about Abraham.  God promised to make Abraham’s offspring like the stars in the sky.  Leah told the boys about Jesus coming from the line of Abraham.

To this Heath asked in puzzlement,

Jesus’ great-great-great grandfather was Abraham Lincoln?

I think he now has Abraham and Abraham Lincoln cleared up.