This is situational irony because one would except that his days of being compared to "A dog, for Pete's sake!" were over. He changed his name to harry because that was his tactic to solving the problem. Everything was going well and everyone was calling him Harry, but then when he talked to Ciara he found out that her dog was named Harry. He went through all of that teasing just to be put back in square one, so this is a situational irony.
