They are blue. So they'd be Blue Silver Partridge Brahmas. Basically the same as a Dark Brahmas but blue rather than black. If they all free range together then if you pair them up they may not breed true.
Gorgeous! I want a Dark Brahma someday. I was totally unopen to feather-footed birds until I sent my husband to pick up my chicks and he came home with an extra, because he wanted to name her Buttercup. My Light Brahma, Buttercup, is the most docile, goofy bird and I adore her! She has changed my view on feathered feet forever.
Here she is sunning in my neighbor’s yard:
And here she is visiting my lap:
(Her face isn’t usually so pale; I think she was molting.)