Spelling error

I recently sent in my MacBook Pro for repairs, when I got it back the name that is assigned to my computer was spelled incorrectly. Now, everywhere on my computer, I have to correct my name, and in most cases cannot. I was hoping that somebody here could tell me how to fix this.

Sincerely,
There is an "a" and a "h" in Meaghan

 

Thank you for your advice, I (quite obviously) don't really know what I'm talking about. I just know, that after I got it back the name of the computer was changed to Megan Culk's Macbook Pro. Not a huge problem, but I find myself having to add those two little letters all the time, and was hoping there was an easy was to fix this.

 

Thank you! That did work!