I think that the time of grabbing names that are widely popular, like search, teach, design... has passed. Because when you think of something good, there is always someone who beat you already to it. Take a look:
http://www.worldcup2014.com/
http://www.worldcup2018.com/
http://www.worldcup2022.com/
http://www.worldcup2026.com/
http://www.worldcup2030.com/
...