For a long time I have been writing under the name "David Rockoff," David being my first name and Rockoff being my grandmother's maiden name. A few months ago, upon his death, I learned about the already well-established David Rakoff. I shrugged off the similarities in his name and my pen name, and continued writing as David Rockoff, but a few days ago someone reading one of my stories noted the similarity. Is this a problem? Do I need to write under something more unique?