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. No official surnames are included; any name ending in a surname is actually a middle name.
Boys:
Arthur Peter
Conor William
Jacob Lewis
Rory Patrick
Rowan Christopher
Shelby-James
Theodore James Ayrton
Girls:
Ada Frances
Ada Jameela
Blanca Patricia (half-sibs: Maximilian & Salvador)
Cerys Katy
Edie Carla
Eliza Henrietta Charlotte
Hannah
Lola Dottie
Matilda Jean Jennifer (Edward)
Mimi Eloise Rose (Ionie Cecelia Mary)
Ottilie
Willa (Violet Lorna, Alfie Tom Winston & Christopher "Kit" Arthur Evelyn)
Zara (Olivia & Philippa)
Zara Grace (Emily Kate)
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.