I don't know why Timber says his name so much, but he has been doing it since I got him. I've noticed he does it when he wants attention. For instance, when I'm feeding the cats, he will say Timber several times (like he's saying don't forget me). Same when I'm handing out treats and he is waiting for his. He will also say his name when I'm in the other room and he wants me to come back (after contact calling several times). If saying his name doesn't get the resuts he is looking for he moves on to "come here" and other things.
They are certainly all individuals that way! I'm not sure what saying his name means to him, but I'd sure like to know! I know he associates "Timber" with himself. When I say it, he always looks, comes toward me, or whistles.