Nothing is really known about the Razzashi tribe. It was formerly mentioned by the Razzashi Coins, found in Zul'Gurub at the first engagement of the Horde and Alliance. The other coins refer to tribes, but no other mention of the Razzashi tribe can be found.
In Chronicle there is mentioned the Razorbranch tribe who are not described or mentioned anywhere else. It is possible that they were the Razzashi, if the Razorbranch were not the early Sandfury tribe.
The animal species may have been named after the tribe like other beasts the tribes bred.