A good user name is usually a derivative of the person's name, such as "BobSmith". If that is already taken, a good tip is to try adding an adjective to the user name, such as "SillyBobSmith." One can also add numbers or letters to the name, such as "BobSmith123."
Matt Koval explains that keeping a user name as short as possible makes it easier to remember and fast to type in on a regular basis. Choose something relevant to the site being accessed. For example, if an individual named Bob joins a computer forum, he can use "ComputerBob." Overall, decide on a catchy and memorable user name for a strong online presence.