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.)
Cool name. I have nothing productive to add, but Sage against the machine just came to me as I was reading your comment. Please feel free to do with it as you wish.