I doubt the little kit will be deaf, even though he may have blue eyes. It is true that pure white cats with blue eyes tend to be deaf; this is something genetical, the deafness being linked to the combination of dominant white fur and blue eyes. But it's not a rule all blue-eyed white cats are deaf; these cats just stand a higher chance of being it. It also only counts for the "albino" blue eyes; a Foreign White cat for instance also is a pure white cat with ble eyes, but it's also a Siamese but only with pure white fur. And Siamese blue eyes don't have a thing to do with deafness. Besides, a kitten as young as that mostly does tend to have blue eyes, almost all kittens that age do. The eyes usually color later in life, after a few months. On my Bisou for example, I was stunned to find him having grey eyes when I got him at the age of eight weeks old. But he has the most stunning green eyes I've ever seen on a cat now. If you want to be sure about this kitten, take a sound-test on him. Snap your fingers behind him, without him seeing you, and see if he turns around to see what that was. As for reassurance: I have a 13-year-old cat named Tibsy, and she's white with two black patches over her ears, a few black patches on her back and a black tail, and she's not deaf. She also had blue eyes when she was just a few weeks old, but they turned to yellow after a couple of months.
And "Cookie" for a name? Doesn't sound bad at all, but for a boy kitten? Quite frankly, I think it sounds a bit girlish. But that's just my opinion, of course. I personally like to give my kitties capricious, baroque names. For instance, I used to have this really big black cat with white feet and a white triangle on his throat, and his full name was Duffield Jones MacDuff (his call sounded like McEow, so hence the Scottish name). If you would like to find a funny and/or unusual name for any cat, try looking though books on completely different subjects, like interior decorating, astronomics or car-models. That always gave me great ideas.
Anyway, I wish you a long and happy time with your new kitten, no matter what name you may decide to give him!