Ok, I did some investigating and heres what I found.
"Accusations of plagiarism
Rowling was sued by Nancy Stouffer, writer of The Legend of Rah and the Muggles. Published in 1984, the book featured a protagonist named Larry Potter, and also included such characters as Lilly Potter, Larry's cousin. Stouffer alleged copyright infringement, but U.S. District Judge Allen G. Schwartz rejected Nancy Stouffer's claims that she was plagiarized and fined Stouffer $50,000 for "submission of fraudulent documents" and "untruthful testimony." Stouffer was also required to pay a portion of the attorney's fees incurred by Rowling, her U.S. publisher Scholastic Press, and Warner Bros. Films. Comic book fans have noted that a comic book series first published in 1990 by DC Comics called The Books of Magic by Neil Gaiman shares many similarities to Rowling's book. These include a dark haired young boy with glasses named Tim Hunter who discovers his own potential as the most powerful wizard of his age after being approached by magic wielding individuals, the first of whom gifts him with a pet owl. Rowling officially denies being aware of this series, and Gaiman has gone on record stating that he believes similarities to be either coincidence or drawn from the same fantasy archetypes."
-http://www.iridis.com/glivar/Harry_Potter
It may be rumors, but I think its just a little more then coincedence eh?