Omitted are the nine extra instances of #000000 that are on the actual NES palette.
Hex value source: Almighty Guru
I got the color names by searching the hex code at Color About and selecting the closest match. Some colors were too close to each other and came up with the same name. In those instances I just made a judgement call.
If any color afficionados really want to fix this up, feel free to hit me with a PR.