Below is a round-up of the birth announcements from British newspapers. Sources include a national paper (The Telegraph, The Times) and a broad range of local newspapers from across England, Wales, Scotland and Northern Ireland.
Sibling names are in brackets.
Boys:
Alfred James (Eleanor Anastasia)
Andrew David (Joseph Duncan)
Christopher "Kit" Robert Airey
Frederick Edward (Frances Harriet)
Hugo
Jolyon Alp (Wilfred Charles)
Kit William Eland
Rafael Rivers Mattos
Rupert Arthur (Willow- Rose & Jasper)
Theodore Jay (Honour, Darcy and Chester)
Wilbur Jacob (Arthur William)
Zachary Charles Michael
Girls:
Amelia Elizabeth May
Bella Mae Myra Joyce
Camilla Anne
Cecily Jane Mary
Darcie (Freddie)
Margot Violet Elizabeth
Olive Grace (Harry Dennis)
Ophelia Maeve
Poppy May (Amelia & Max Alexander)
Willa Christabel (Rollo Ralph)
Twins:
Steffan & Elis (Gruffydd)
I cross-reference older BAs to find the full names of the siblings, however often they are missing (especially the eldest siblings, or for half-siblings) which explains why you will sometimes see something like: George Henry (Lucy, Emma & Jack Arthur). "Lucy" and "Emma" may well have middle names as well; I simply cannot find them online.