If you have recently deleted pages from your site or changed page names and they are still showing up in Google's index this is perfectly normal. It will take some time for Google to re-spider your site and see that there have been changes. When these changes are detected Google will remove the pages from their index and put in the new.

This can take some time, but will eventually happen and is out of our control. What you can do is resubmit your sitemap to Google as this may get the spiders to your site sooner, but it is not a guarantee.