Yeah, I'm finding duplicate names also. Can't understand how that happened, unless the site is showing names from "ALL" trees.. I don't to stuff around deleting incase it deletes root names.
If your tree was created directly online, then click on the person until you get his/her details on the left side of the screen where the person list is shown. Then click on Delete this Person.
If you created your tree in Family Tree Builder, then all changes should be made there and then republished to the site. To delete someone in FTB, click EDIT then Person > Delete Person.
I think I did some online and off, so I will try both options.
Thanks a bunch!