Adding User to Correct User Folder Name

So when I did a system restore on my computer to return it back to factory default...I logged in using my Microsoft account which is an email starting with "ArilyBoo......." However my name on my Microsoft account is "Summer"...It's always been "Summer" all my folders in the past have been "Summer"...this time however it named my User Folder "Arily"
So I went in and hit login with a local account instead...and I changed my username to "Arily"...and then I was going to create a second user account named "Summer" and make it an administrator so I could switch everything over to the "Summer" name as it was supposed to be. I'm getting an error message though when trying to create the account saying "please type a different user name". This is when attempting to create a local account with "Summer" as the username.
My only guess is there is still evidence of "Summer" somewhere that's preventing me maybe of using the same name on two accounts, even though I've renamed the first account "Arily".

Any Suggestions?

Thank you Brink.

I think I messed up really bad and I don't know what to do now, I'm getting an error location unavailable something about onedrive desktop and my toolbar pins are gone and my desktop icons are gone. Also every time I open file explorer I get the error message...every time

So then I cannot change the name at all?

I might have made a mistake earlier so I'm going to try again maybe?

Also I should add that I was initially signed into onedrive however, I removed my account because it was doing this weird sync thing that I do not want it to do...I haven't removed onedrive I just removed my account from it.

Here is the original error message I had gotten in case that it can shed light. I've rolled everything back and I don't get it anymore.