How to Remove Someone's "@" Information from an Excel cell?

Hello Excel Team, 

 

I don't know how this happened, but someone's "@" name was entered on my Excel report and I can't figure out how to remove it. 

 

I've removed the entire row and it's still in the field.

 

Anyone know how to remove this please?

 

if I hover over the initials, a name is displayed:

 

This person does not know how her name was accidentally added to my report.

 

Thank you in advance for your help.