Hi Faith. It means that while reading someone elses hub they have clicked on your name from the comments that you made. I often do this if I spot someone that I haven't visited in a while or if I like what they said and would like to read their hubs.
They may have also clicked on a link in the hub itself, for instance in marcoujor interview series.. Any links that Maria includes whether to a profile or spacific hub are clicked on by the readers will show as traffic coming from marcoujor .
In other words coming direct from their hub to your profile or hub.
Hope this is helpful