Nothing but that we are not cats.

[He shrugs. Actually, if this is how cats are, then sign him up for it, it's better than humans.]

It isn't made up, exactly, the name of a colleague. The point was to avoid the obvious questions of 'Berserker', but fear of a true name being recognised. But hiding the true name is the point of the title. Frankly it's hardly better, as that man was used in the novel, it would be simple to see through.