Looks like P. setiferum to me. Out of more than 100 fern species & cultivars that I grow, P. setiferum is the only one that has exhibited the branching stipes. They are an extremely variable species and among a large population, you are likely to find dozens of unique specimens. Many have been chosen, especially by fern growers & breeders in England, and assigned cultivar names.
However popular the cultivars are, Monrovia Nurseries has chosen to propagate and mass market the species. I'm sure they are produced by tissue culture cloning, but even that doesn't insure there will not be variations in the plants.
Enjoy your beauty!
Rb

Here is a link that might be useful: Polystichum setiferum

Thanks for the info! This is my first Polystichum.

I once found a christmas fern (Polystichum acrostichoides) in the woods that had two branched stipes like that. I moved it to a spot in my garden where I could watch it ... then some critter tunneled under it and it was gone! Some vole, I guess.

Good luck with yours!