Hello, unless these names are official and signed (by the BLM or another overarching government entity or landowner), it is more likely than not that these names should be removed or at least moved to another tag. If these are names used exclusively by the mountain bikers of these trails, the tag 'mtb:name=*' could be used instead of the regular 'name=*' tag, which implies a more formal on-the-ground case.