The one I'm most familiar with has already been mentioned - Joe McDaldno > Avery McDaldno > Avery Alder. I actually like some of the games they made(I still want to try out Ribbon Drive someday - the idea of creating a road trip story using a group-made song playlist just sounds fun.), and for a couple years back in the day was part of the group over at Infrno.net that was really into Monsterhearts. I forget how I found out, but at some point I found out that on other big RPG forums that Infrno actually gained a bit of a reputation because of the number of people playing Monsterhearts on it at one point. I know that the games I was in always followed "fade to black" and "hollywood casting" rules, but I didn't police all the games there, so it wouldn't surprise me if some of them got creepy. I'm just pretty big into urban fantasy in general, and the game is super simple to play and run, so that was enough for me.
Some of the rules were a bit vague, but McDaldno/Alder had a blog where they would occasionally talk about the intent behind some of the rules bits. How they were supposed to work and all that. So I'd check there for rules clarifications. But between the game design stuff, there'd be things about their personal life. I can't recall exactly when the transition began, but at one point they were begging for donations to help with an adrenalectomy - removal of the adrenal glands. Literally said they were poisoning them. It was weird, y'all. And tbh I played MH from the free handouts and playbooks, so almost never looked at the book. The few times I did, yeah . . . you could tell it was a very "woke" product.
Then the people I gamed with, multiple times in many cases, started coming out as trans. The first couple were m2f. There was another group member who I'd suspected for a while due to their voice, then later heard them flat-out state it, suspicion confirmed. And a 4th . . . I don't even know. She was already a woman, and admitted to being perfectly happy being a woman, but since she didn't 100% conform to all of the stereotypes I guess she needed a special term, too? That was a facepalm moment right there. It wasn't long after that that I kind of noped out of that community, signed out of Infrno and Skype(the VOIP of choice at the time, as this was before Discord) for the last time, and went my own way. I came across one of them by coincidence on Roll20 a couple years later - an f2m I forgot to mention, though I didn't know it at the time and actually found out when we gamed together on Roll20 - and found out that it wasn't just me. The whole group kind of disintegrated around that time anyway.
Very odd history lesson. But yes, I know of at least 1 trans game developer, at least 1 other whom I suspect(though I won't blast them online since I don't know for sure and if they haven't gone public with it then it wouldn't be my place anyway), and had at least 4 trans people in a relatively small online group of gamers I played with for a couple years back in the day.