1) German surname 2) Michael of Worf fame 3) Star trekker worf 4) Worf portrayer 5) Worf portrayer Michael 
[board game] Dorn is a diceless tactical fantasy board game developed in Czech Republic and published by Altar in 2006. One or more players control a group of heroes and one player controls the evil Dornkeeper and his monsters. The heroes need to collect three artifacts from the game board and then they can challenge the Dornkeeper himself....
• (n.) A British ray; the thornback.
Dorn noun [ Confer German dorn thorn, Dutch doorn , and German dorn fisch stickleback.] (Zoology) A British ray; the thornback.