You can name him whatever you like. My male dog we lost had a neutral name and my female has a male name. We made it into a girl's name. If you are giving him a name based on the litter letter, you can register that name but call him anything you like.
Pretty common over used name. Why would you want to name something that signifies negativity. Bad Karma or Karma will come back to get you.
There is no good Karma. Just like there is no such word as irregardless. Its just "regardless"
Karma... unless short for Karman, which is not really short.