While it could be Hopi in origin, I highly doubt it. This is almost certainly massed produced to be sold in places like Wallmart or Zales or small mom and pop jewelry stores. It is very unlikely that the maker will be easily found as only the original retailer will know.
I deal in Native American jewelry and this is definitely not Hopi in origin. It looks rather contemporary to me. Also the chain may have been added to the pendant which explains the two different maker's mark.