Among other things, the latest advice on hardening WordPress recommends renaming the default admin account to something — anything — other than “admin”. Simple instructions below.
To change the admin’s login name:
update wp_users SET user_login = 'webmgr' WHERE user_login = 'admin';
While you’re at it, be sure to change user_nicename as well, since that also would contain the ‘admin’ value by default:
update wp_users SET user_nicename = 'webmgr' WHERE user_login = 'webmgr';
Finally, you’ll also want to change the display_name (published as “Nick Name”) to something other than “Administrator”. Like this:
update wp_users SET display_name = 'Web Manager' WHERE user_login = 'webmgr';
So there, you’ve done it. Renamed your application super administrator so that it appears to be a mere manager.