What does the color of player names mean in Monster Hunter World?

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I just saw this image and was wondering what the meaning of the different name colors is as well as how to unlock change the color.
So the question in total is, what is the meaning of each color and how do I unlock/change the color? Can the color be changed at will?
EDIT:
As it seems that the completion of specific quests changes to name color, I would like to know which quests specifically unlock which color.
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How do you get orange names in MHW?
Orange name is from completing the HR100 quest, but if you already started Iceborne you can't get orange name anymore. Purple replaces Orange for finishing Iceborne. Purple replaces Orange for finishing Iceborne.How do you get yellow name Monster Hunter world?
How do you unlock it? Golden/Yellow names are unlocked after you complete all optional quests in all ranks. The last one is "We Run This Town" and it's unlocked after you've done every other optional quests.Do Monster Hunter characters have names?
Character do have names, but theyre usually never called by their names in game.Monster Hunter World: Monster Names English/Japanese
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Images: Petr Ganaj, RODNAE Productions, RODNAE Productions, Andrea Piacquadio