The story
CGU Insurance was formed through the global merger of Commercial Union plc and NZI's parent company, General Accident plc. The global merger brought together two highly regarded insurers with almost 160 years of experience in Australia and New Zealand. The acronyms of those two insurers were melded together to form CGU which is subsequently no longer an acronym.
From Wikipedia’s article on CGU Insurance, shared under CC BY-SA 4.0.3