Site has been hacked???

Hello, in awstats under "Authenticated users (Top 10)" their is a name and he has visited on the 23rd and 27th. Normally its just empty under their and i dont know what this name is its not a login name i have ever used. It says only 1 hit for each of the 2 days this person has logged in.
What does this mean? Someone has access to my cpanel? Or something else?
I dont know that much so i appreciate help! Also what i can do to check and fix etc. Thankyou

 

 

 

 

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