You could steal ideas from Debian, Ubuntu, Fedora, and several other Distro for giving codename to their release. For example, in Debian, they take a character

You could steal ideas from Debian, Ubuntu, Fedora, and several other Distro for giving codename to their release. For example, in Debian, they take a character name in Toy Story for their codename. In Ubuntu, they take an animal name in alphabetical order.