Hello,

When someone is trying to open the application and the page is yet to get loaded completely then it is sometimes showed as Unnamed. 

Also if you have users accessing via IAC  and the user just closed the browser window then the requester get displayed as Unnamed. 

The other remote probability could be with DWA where user accesses the link, processed it but then due to some network issues failed to submit the assignment.

Have you identified any specific use cases?