The Collaborative International Dictionary of English v.0.48:

Dagan \Dagan\ prop. n.
   the Mesopotanian god of agriculture and earth; it is a
   counterpart of Phoenician and Philistine Dagon.

   Note: See references to Dagon in the Bible and in the opera
         Samson et Dalila.
         [WordNet 1.5 +PJC]

WordNet (r) 3.0 (2006):

Dagan
    n 1: god of agriculture and earth; counterpart of Phoenician
         Dagon