It helps when you can get something to tie to to eliminate the many names. I had a place, time and name, so it started easy. You have a name, but at this point, you can not tie it down. Like you say maybe the records your looking for will help. These organizations have in house genealogist to help tie down true relationships, but I don't know of data. If you can tie Benjamin to a town or unit it gets easier. There is help at this board to show you the way.