The site display name is not stored with the audit data. If you're using the OOTB reporting, you will get the Site ID and can correlate that to a site title (you should also get the path to the item, which will include the relative URL).
3rd party products, like Axceler ControlPoint, can associate the site title with the audit data.
SharePoint - Nauplius Applications
Microsoft SharePoint Server MVP
MCITP: SharePoint Administrator 2010
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This post is my own opinion and does not necessarily reflect the opinion or view of Microsoft, its employees, or other MVPs.