Creating a Steam account requires choosing a unique name that represents who you are on the platform. This name is called your "Steam profile name." there is a maximum length of 15 characters for your Steam name, so you can use any combination of letters, numbers, and symbols. We're going to talk about some cool and funny Steam names in our today's article. You use your Steam name to identify yourself on the platform and in games. You can also see it when you chat with other gamers. 

See also - https://talkitter.com/read-blog/56658_best-funny-steam-names-ideas-to-use.html