Mauer is of German origin and means "wall" or "defense". It's composed of two elements, 'maur' meaning wall, and '-er', which is a common German suffix denoting an agent or doer. This name was originally given as an occupational surname to individuals who were masons or worked with walls in some capacity. In the Middle Ages, surnames were often bestowed based on one's profession or physical characteristics of the bearer or their residence.
The name Mauer had 12 births recorded over two years, with 7 babies named Mauer in 2010 and an additional 5 in 2011.