It's because a redirect had not been created for your project yet. When a new One Name Studies project is created, Doug or I, as the leaders, need to be notified so that we can create a redirect so that the system recognizes that there is a project for that surname. I used to go through the list of studies on our project index page on my own to see if there were any new projects, but now that we have almost 1000 studies, it has become too difficult for me to keep bumping the list We now ask on our project page that our project members take that responsibility of letting us know.
There is now a redirect for the Trevathan Name Study. ;-)
Alison, One Name Studies Project Co-Leader