Surely the women named Dick must have a transliterated non-english name, right?

Or maybe they're escorts who changed their name to be an advert e.g Mrs D Rider, Mrs D Hunter, Mrs D Spitz, Mrs D Browning, and of course, Mrs D Burns.

I think it's worth noting that blue would be the most popular colour if you consider that there were two shades of blue and only one of other colours.

If I had to guess why, I'd say it's from colouring in skies.