He is not a main character, and he will appear in one chapter of my project. I know about the Sirius Black thing though......... But I can not picture my character with any other name. He is not anything like Sirius Black, but I just picture him as a "Sirius" every time I think about him. I know Rowling didn't invent the name Sirius, but her books are so popular that (I think) it might not be a good idea to use the name Sirius before some years have passed. Correct me if I am wrong. I thought about using Merope for a character long before Harry Potter And The Half Blood Prince was published, and the same goes for the names Bellatrix and Regulus. I have always been fascinated by star names. Are these names pretty much untouchable? How would publishers react to seeing characters named Bellatrix and Sirius? Would they frown upon it even if they are only background characters? What about star names in general that are not used in the Potter books? Please help me.