Hi there. Are you talking about your wordpress.com username being the same as someone else’s username at another blog host?
Or are you talking about the name of your wordpress.com blog being the same as the name of another blog on another blog host?
My blog Club Penguin Plaza, is the same name as another one, but the person that made the other one used his username for the url, so it did not show up on google when I searched Club Penguin Plaza. I am worried that I will get in trouble.