Abraham just a black name?!

Kaity
So we decided on a name for our baby boy due in May. We are a white family, and my other kids all have blonde hair and blue eyes, so I suspect he will too. My other boys names come from the Bible (100% not on purpose). 
When I told my family that we have chosen Abraham John as a name (AJ for short), my step brother said "is he black?" And my family all agreed that it's a "black boys name". I'm kind of heartbroken to get such resistance from them on a name that my husband and I both love.....