Why we assign those funny names
There must be a way to easily distinguish between users. Some systems use an ID of a user. But that solution isn’t very handy because it can be hard to memorize long numbers.
This is why each new, unidentified user's name is comprised of two components: random adjective and random noun. There are tens of thousands of combinations so you will never run out of nicknames. It’s also easier for the support teams to communicate as the identification of users is simple. Other companies using this same method, including Google in its popular Docs, Slides, and Spreadsheets editors.
These randomly generated names will not be used as user attributes in your communication, so you don't need to worry about sending an email starting with “Hi Purple Turtle”.