I guess this is more a question of process than one seeking direct info.
I found a copy of the Psychopqathia Sexualis while helping a friend move a few years ago, and almost by happenstance, I opened it to a case-study describing what is almost indisputably a trans woman. Being trans myself, my heart breaks every time I read and re-read her account, knowing that she never had the opportunity to live the life I do now.
Her account is Case 108, here.
I can't help but want to know more about her. Who was she? What happened to her? What was even her name? But I'm no historian, I have no idea where to even begin? The only thing I've thought of is to try to figure out which edition of the book she first appears in? Should I reach out to like, a local univeristy history dept? Are there any book on the historiography of sexology I should look up?
Also, I guess a question I shoudl ask myself, is there any chance of actually uncovering her name or is this a wild goose chase?
Well, first you're probably going to have to learn to read German! That being said, Kraft-Ebbing's papers have been archived at the Wellcome Library. So, presumably, the original research notes for Case 108 should lie somewhere in those boxes of stuff. You would need to contact the institution and arrange access to the materials, abiding by whatever rules or restrictions that may apply, and hopefully somewhere in the mass is the raw material that Kraft-Ebbing used when he wrote about that case.
That being said, there's no guarantee that you'll find an actual name! It depends entirely on his case notes, which might not deal with a patient he personally had access to, but might have been based on records from some other psychologist or institution. But if I were digging into that particular case study, Kraft-Ebbing's papers is where I would start.
Alternately, you could do a survey of other psychosexual studies of the period and look for points of comparison - it is possible that the same case study made its way into two or more separate works - but that's the needle-in-the-haystack approach. With Kraft-Ebbing's papers, you at least have a reasonably good idea that you're at least looking in the right haystack and that there are needles in it.