Hey Timeslice,
I definitely know what you mean and a lot of thought actually went into this question of Horde vs Herd. While technically Horde means a group of people and Herd means group of animals, the zombies are also technically no longer people. I like Herd for its simplicity and balance with the four letters. Horde feels like bloody, ripping flesh, kind of zombies while Herd kinda feels more like simpler less gruesome zombies. Hope its not too irritating, if more people feel that it should be Horde instead we can definitely make a poll or something.
Thanks for the feedback,
Rafi