Xbox was on Microsoft’s naming test only to prove what a bad name it was.
In 1999 the DirectX team shortened DirectX Box, after Microsoft’s gaming software, to Xbox in email. Marketing hated it and drew up a long list of better names, 11-X among them, keeping Xbox on the list only as a control to show why it was horrible. In focus testing it outscored every name marketing came up with.
Xbox on Brandseum