Hi,
Debian and Mozilla had a struggle about using Mozillas Trademarks in Debian if the software and logos are changed but the name is not.[1] This should also apply to Wikipedia if people want to distribute Wikipedia content or modified parts then they cannot just call it "Wikipedia" - I just wanted to clarify and give an example because many people think that the our name and logos are as free as the content.
Greetings, Jakob
[1] For instance http://www.linux-watch.com/news/NS3364701970.html