I'm trying to find my Grandfather's original name.

He changed it when he became 18, back in 1941. He was an orphan and never told anyone what it was before he changed it. My dad always said Bair was not far from the original spelling -- he just didn't want it to be the same as someone who didn't want him.

My grandfather passed away last year and I want to know more about my history and his. Can someone please help? Thank you.