You can change Site Name (Company Name) on Admin Side.
on XOOPS 2.5.0:
1. Login as Admin
2. User Menu-> Administration Menu
3. Control Panel Home-> Preferences-> General Settings (or Modules-> System-> Preferences-> General Settings)
4. Site name: <yourcompanyname>
5. Slogan for your site: <yourcompanyslogan>
6. Go!
What that still?