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Unfortunately I'm not aware of any function in AR that allows us to change our user name. I signed up long before I realized the importance of all those pesky details that add to your SEO.
I didn't know it was possible to change your username.
I used my niche market area as my user name to begin with. Not sure you can change your user name on your account though.
My name works fine.
Dipti nailed this one!
I do not think it matters.
I don't know.
I don't think it is really important.
It could have some positive SEO benefits if it contained some good keywords.
I think it is important to retain your personal identification with your blogs. Use your company names on your websites.