What's Your Name?

I like nick names. It is a factor in name selection and Jacob has some obvious ones. I noticed the other day that Jacob wasn't responding to his name when I called him from the other side of the room. He looked at me when he heard my voice but wouldn't achnoledge his name... I continued
"Jake!....Jakey, Jake Jake, Jakes, Jay, Jay Jay, Baby Jakey, Chubs, Chub Chub, Chubalicious, Bubby, Bubbs, Sweeties, Cutie pie....
Nothin. Huh. I wonder what the problem is? Certainly he is not confused or something.