A WikiName is a word that uses capitalized words. WikiNames automagically become hyperlinks to the WikiName's page. What exactly is an uppercase or lowercase letter is determined by the configuration, the default configuration should work for UTF-8 characters (digits are treated like lowercase characters).
When you click on the highlighted page title (i.e. WikiName on this page), you will see a list of all pages that link to the current page. This even works on pages that are not defined yet.