6 names.... and now your back tracking. Lolol. Welcome to my world. Thats why I gave up and just said words/names till he reacted.
He really did look at me when ever I said Charlie. Not loud or weird just plain normal voice. So he picked his own name.
He also responds to Dog. Especially if on other side of yard for example.
I yell "DOG" 2 or 3 times and he comes running. Roflol. That's after ignoring his name.
Love All Life, Thank You For Posting! :)