OFFICIAL Change Farm Name, Forum Name, Avatar Name/Gender/Appearance

[Palmarina]

Hi I have a question about the farmers' names.
I see on the market that a lot of gamers have the word 'Avatar' in their name. Is there a particular reason for that?
Two of my neighbours also have this word in her name. I asked one of them why she added the word 'Avatar' and she didn't know what I was talking about. She presumed that Slashkey added it.
Who can help me with this question please?
Do they add that themselves or not? And in case yes, why? Is there a reason?