assuming it's not totally random like the billions of colour names there are.  Yeah, sorry to tell you that, but designers pick colors based on a color guide like this one, and they are usually decided upon based on the manufacturing limitations. Some fabrics are more resistant to colorants than others, thus they're harder to dye. Only reference colors (like navy blue or lavender grey) are properly named. Over 99% of the available shades don't have a name, and the marketing department just pick whatever they want.