My wife's great grandfather's surname was YBAVEN and came from the Chihuahua area. I believe this must be a varient of the more common names of Ibabin, ybabin, Ibaben or Ebaben? I can find these names in the new world, but I have not been able to find it in the old world?
My wife's mother thought he was French? But I have not been able to find it in either France or Spain. Could it come from Basque or Celtic roots? I have not been able to find it yet?