Why do some people have surnames of colours - White, Black or Brown

In Spanish speaking countries, the surname Rojo (red) exists. Also Rosa (pink), although this is much less common.

According to "The Oxford Names Companion" Black, White, Gray,and Brown are all nicknames referring to peoples appearance, mainly hair/beard colour, Red is a variation of Read which comes from a nickname for someone with red hair or a ruddy complexion. Green is one of the most common and widespread of English surnames and according to the book is either a nickname for someone fond of dressing in this colour, someone who had played a part in the 'Green Man' on May Day, or a topographic name for someone who lived near the village green. The other colours were apparently not applicable to peoples appearance.

Mr Plum in the study with a lead pipe lol

In Chinese, we have blue, yellow and white.

Mostly fro hair eye, or skin color

There's also Green or Greene.

That's what they are today. But I wonder if way back, 2, maybe 300 years ago those were just part of their original name.
Names back then often reflected what you did for a living.
John the brown bear hunter.
Lucy the green apple picker.
Michael the black coal miner
Sarah the white swan keeper
Stuff like that.

Well ya know, out in the blue ridge mountains of Kentucky they did have blue people, no one could understand why? Do you know why these people had blue skin.....no, WAIT, I should ask this in a question...carry one. 🤔

Well I knew someone with the last name Redman but never just the name Red.

Knew some people with the last name red and another girl last name green.

Because yellow

Mr Turquoise i presume