It is possible to name your default index page something other than index.html, index.cgi, index.php, etc., by using a directive in a special configuration file in your webspace. That file is called '.htaccess' (a dot followed by 'htaccess'). The directive needed is:
DirectoryIndex foo.html
That will make the default page (i.e., the file name that will be requested if there's no filename in the URL, www.domain.com/) 'foo.html'. The change will affect the directory the .htaccess file is placed in and all sub-directories.