The ancestral home of the Schneider family is in the German state of Bavaria. The name Schneider is an occupational hereditary surname, a type of surname that was taken from a word describing or common to the profession of the original bearer. It is a name for a person who worked as a tailor.
The first mechanically-propelled, two-wheeled vehicle may have been built by Kirkpatrick MacMillan, a Scottish blacksmith, in 1839, although the claim is often disputed.
The answer to the original question is that no one person really invented the mountain bike. Joe Breeze built the first modern mountain bike frames, but without the ideas and innovations of a whole bunch of other people, he'd have had nothing to hang on them, and no inspiration to build them in the first place.