Bitcoin Diamond is a hard fork of the Bitcoin. One that was not announced, and that was a surprise to many people. This has not contributed to the name of the currency. People who look at their wallet in the morning do not immediately like big surprises and mutations that have not been announced. Bitcoin Diamond paid particular attention to the anonymous nature of the currency and the owners.
In 2017 two Bitcoin miners named Team Evey and Team 007 decided to call the network protocol. Bitcoin Core to change. They were not satisfied with the way Bitcoin developed and thought they could improve it. This fork took place on November 24, 2017 block 495866.