When I logged into Stack Exchange Data Explorer for the first time today using my normal Stack Exchange Open ID I was given the display name Jon.Doe8551. There are indeed 66 pages of Jon.Does on SEDE, why is that?
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When attempting to change my display name on the site, I was presented with an error stating that on the Data Explorer all usernames need to be unique. I assume that everyone who attempts to associate with a username that is already in the system is assigned the next available Jon Doe name.