I do know my "first" name... Aimee Marie...I find it funny that when I was a teen and venturing into writing, I used "Aimee" as a pseudonym.
My parents told me that they never knew I was named by my birth mother or they wouldn't have changed it. They were instructed by their attorney to "pick out a name." My dad chose Christie...and spelled it. I've seen the paperwork... and yet, to this day, he spells it Christy.

LOL
In as far as a support group, I did attend one in Nashville many many moons ago. It was during the two years that I waited for Post Adoption Services to process my request for search.
Sigh... I wish I could say that I endorsed the whole support group thing. For me (and just for me) I think that its a way for me to avoid dealing with my own shit. I am a fixer by nature and find that I take on other's issues rather than focus on my own. I also have enormous issues with people I classify as "perpetual victims." I find that I have little patience with them. I found myself at this support group meeting, looking at people who had been dealing with their issues for what I consider to be far too long (decades and decades) and biting my lips off to keep from asking them just how long were they gonna be caught up in the woe is me mentality before they moved to the next step in the healing process.
Perhaps I shouldn't be quick to judge, but I know myself and I have a limited amount of energy to expend on others. I have to self monitor closely so that I don't get sucked into others' stuff and neglect my own.
This isn't a judgement on others nor do I want to derail by instigating/offending anyone. I recognize that we are all different, deal with things differently and on our own timeframes. This was merely a response to the support group question and my experience with it. Your mileage may vary.
On a happier note, this time next week, we will be back in Nashville for the holidays. Even as much as I relish the distance between my family and us, I do miss them and think that a three night/two day visit is just about the perfect length of time.
I hope that we all have a lovely holiday season, surrounded by people we love and who love us in return. Sometimes its not about the family you were born into, the family to whom you were adopted, but more about our chosen family. I'm grateful for each of you in my chosen virtual family.
Christie