The Full Moon in July is the Buck Moon, named after the new antlers that emerge from a buck's forehead around this time of the year. It is also called Thunder Moon, Hay Moon, and Wort Moon.
Another name for the July Full Moon is Thunder Moon because of the frequent thunderstorms in the summer. The Anglo-Saxon name is either Hay Moon, after the hay harvest that takes place in July, or Wort Moon, indicating that July is the time to gather herbs (worts) to dry and use as spices and remedies.
-Information from www.timeanddate.com/astronomy/moon/buck.html