how to change the blogger name google sees

Hello,

I have the blogger names displaying correctly on my site, but google is seeing the joomla usernames and listing them in search results.
(I have Settings/Layout/General/User - Display name format set to Real name)
Example: /index.php/blog/blogger/listings/joomla-username
How can I fix this so my joomla username is not listed in the url structure?

Joomla 2.5.18.

Thanks,
Beth