color-name is a tiny CLI tool that spits out a colour name when passed a colour hex.
Clone the repo, cd to project root and run go build. Afterwards, you can run ./color-name -h HEX where "HEX" is the hex value of the colour whose name you want.
Supported hex formats include 3, 4, 6, and 8 character length (ignoring the leading "#", if any) hex values. The leading "#" sign can be omitted or added.
Examples includes FFF, #FFF, FFFF, #FFFF, FFFFFF, #FFFFFF, FFFFFFFF, and #FFFFFFFF
For some reason, I feel better when my projects have properly named colours but then I don't know all the names of the thousands of colours out there. However, I have been using this online tool by Chirag Mehta but I decided a CLI tool fits my need more closely. The online tool itself is open source, so I ported it to go.
The colour hex is parsed, normalized and matched against a list of 1500+ predefined names. An exact match is returned if found, otherwise, the colour name of the closet matching RGB and HSL is returned. The predefined colour names were compiled by Chirag from Wikipedia, Crayola and Color-Name Dictionaries like Resene.
Please, note that there's no guarantee that names are 100% correct.