Definitely. I don't think for a second they're related. Anyway, the people who believe that would then go on and say, "so Lily must have actually been a witch, thus defeating one of the better points of the story that a muggle-born's own power defeated the very man who claimed muggle-borns were weak, and even further, Snape is Lily's twin brother, thus giving us that well-needed Star Wars element, and Voldemort is Lily's father! Star Wars again!"
In conclusion, I REALLY HATE the theories that try to make everyone related.