Has anyone that worked on TOS ever explained the rationale for not giving Number One a name? I get that she was some how supposed to be "mysterious" but it seems odd for that mystery to extend to her name. It feels even stranger to have the rest of the crew refer to her as Number One instead of just the Captain. I get that that nick name is an actual term that was used in the navy, but was it used by the crew? I could accept not giving her a name if there was some grand plan for the character that would be revealed in the future...but this was 60s TV. That was not really in the cards at that time. So why do this? As a side note, it was kind of a shame that Majel came back as Nurse Chapel. Had she not done so, it would have been possible for her to return as the Number One character perhaps as a ship captain or even an Admiral.