I just read some prior posts on Homans's Mr. B and saw that the issue of first names came up in April. Some connected it to her disparagement of women, although she does this to men as well (Lincoln, Jerry, Nelson).
This was a thorny problem for me, too, as Tanaquil Le Clercq preferred the nickname "Tanny" to her legal first name (which few who knew her used, unless with playful irony) and Le Clercq seemed unduly formal. So I chose to mix the names, trying to refer to the performer as Le Clercq, for the most part, except where it seemed too awkward, and the woman as Tanny. Using Le Clercq consistently seemed unduly formal to me, which she was decidedly not. I'm not sure that Homans used first names in a way that's anti-feminist, since Jerry is most often Jerry, not Robbins. It's also a matter of how seriously people took themselves, or others did. There was a tendency to separate dancers from choreographers, using last names for the latter (as in Tudor and Hugh, as was common at ABT and in its prior incarnation as BT), so I tended to use that as a guide. Personal preference. But I did mention that in my text, in order to explain the idiosyncrasy for readers less familiar with ballet than those who post on this site. Choreographers and composers, etc., seemed to be viewed as a higher order than dancers. I'm not sure why. Is that still true?