I guess I probably have more experience than the average player, about 25 hours so far. But I also learned my 3rd point the hard way, by doing ~10 hours of research outside of playing to try to optimize. It mostly just drove me crazy, but I did pick up a lot of little helpful tidbits. So if anyone has any general gameplay questions I'm happy to do my best to answer!
Just know I definitely don't consider myself an expert by any means. I'm not even at the level cap yet.
Not sure how uncommon you're looking for, but I think I already did this.
I chose Sage.
According to some quick googling (read: not sure how accurate this is), Sage wasn't in the top 500 names for my birth year, but my given name was top 100.
Though both names I've used have been trending towards more common for most of my life. Looks like my original name is now a top 35 most common, but Sage is still outside the top 100 for females and outside top 300 for males.(Really wish there was more data for the popularity of nonbinary names. I think Sage is probably one of the more popular enby names, so maybe it's not all that uncommon, depending on how you define it.)