Final answer:
The ship name for Meredith and Derek is MerDer.
Step-by-step explanation:
The ship name for Meredith Grey and Derek Shepherd from the television show 'Grey's Anatomy' is MerDer. It is a combination of their names - 'Mer' from Meredith and 'Der' from Derek. This ship name became popular among fans of the show to refer to their romantic relationship.