St. Brigid group is a collective name for the double-flowered varieties, also known as poppy anemones.
Within that group are named varieties, such as A. 'Lord Lieutenant'.
You are right. Someone made these plants using trade names where cultivar names should have been used. The St. Brigid information probably belongs in the "Series" area.
I have made edits on the Anemone cultivars in our DB.
What I want to know is why I don't have these in my garden! You know, I'd forgotten about Anemones; I used to have them. So your database question not only got the db corrected, it provided a public service. Gotta put these on my want list!
Confidence is that feeling you have right before you do something really stupid.