You can't possibly know that you don't encroach. Part of the package of being a professional logo designer is knowing the field. They literally know hundreds if not thousands of existing logos. There are books and references dedicated to finding dupes. This is a very important aspect of the logo design and ignoring it is an extremely unwise thing to do.

With your process you are guaranteed to generate a logo that will look like a blatant derivative or a verbatim copy of existing work. Consider what will happen next.