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:
Artie Oren Theodore
Charlie (Caitlyn, Clayton & Cacey)
Emile Isaac
Harris (Cody & Ava)
James Thomas Dominic
Leonidas Constantis
Rhodri James (Gruffydd & Brynmor)
Sebastian David
Girls:
Aya
Beatrix Astrid (Elliott & Lyra)
Bobbie Liberty Florence
Camilla Honor Louise
Esme (Lennox)
Flora Annabel (Tessa & Charles)
Grace Caroline
Isla Joy
Katherine Rose (Isabelle & Georgina)
Lara Anne Caroline Carew
Lara Xanthe
Margaux Elizabeth
Mika Maelynn (Hideki Ernest)
Twins:
Digby Fellows & Beau Fellows
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.