There are multiple origins and meanings for the name Dean:
1. Derived from the Latin word decanus which comes from the ancient Greek δέκα [theka] meaning - "head of a group of ten"
2. Old English name meaning - "valley". Form of the given name Denton - "valley settlement"
3. Shortened form of the personal name Denis - "follower of Dionysus" or of Daniel - "God is my judge (Dan)"