Bror is a Scandinavian masculine given name which simply means 'brother'. The name has been found as early as in runestones in the form Brodhir. The name form Bror is known since the year 1536. It is also used heavily in a colloquial sense in the city of Belfast. Bror used to be a name that was never given to the oldest son of a family. From the 19th century, the literal meaning of the name has not been as important and the name could be given to any son. Bror was a very common name in Sweden during the first decades of the 20th century. It has since been less common.
https://en.wikipedia.org/wiki/Bror