Peyper vs Pyper???

Anthony Peyper, born in South Africa. Parents: Ferdinand Kasner Peyper & Anni Pienaar.

I have just recently heard that my family might have been spelling our name wrong for the last 3 generations. My grandfather has been in dipute with his brothers as to the spelling PEYPER vs PYPER. Seems like PYPER might be right, but we can't trace the original birth certificates. I have been trying for years to trace anything on PEYPER, but no luck there...hoping to uncover something down this route. Please let me know ifthe truth is out there????

Cheers...