Earlier quoted context omitted.
If there are zero people who cannot tell two colors apart, they should have the same name. If there is at least one person who cannot tell two colors apart, they should have different names.
What does 'telling a color apart' even mean? I did a mini project some time ago, where I basically did some custom color quantization (it was to reduce an image into a configurable amount of discrete colors, to make a pixel quilt with a manageable amount of distinct fabric colors). So I used CieLAB colors to calculate the 'visual distance' between the available colors and then recursively merged colors until I got to…
Being able to distinguish colors on a test such as https://xritephoto.com/cool-tools