What is a computer name?
Computers on a network need unique names so they can identify and communicate with each other. It's best to keep computer names short (15 characters or fewer) and easily recognizable. 
You should use only Internet-standard characters in the computer name. The standard characters are the numbers 0 through 9, uppercase and lowercase letters from A through Z, and the hyphen (-) character. 
Computer names cannot consist entirely of numbers, cannot contain spaces, and cannot be exactly the same as your user name. The name also cannot contain special characters, such as the following: < > ; : " * + = \ | ? ,