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:
Alfred Richard Robert (Francesca Alice Hermione & Amelie Mary Tanya)
Axel Edwin Alderson (Liberty, Hero & Phineas)
Benedict Jerome
Cosmo Charles
Ellis George
Iyssa Nazminborn
Max Oliver Charles
Montgomery "Monty" William Gerald (Minerva "Minnie")
Philostrate "Philo" Frances Eniola
Ruaraidh Felix Monro
Spencer Luke (Dylan David McLeod)
Girls:
Ella Maria (Max)
Harriet Charlotte Elizabeth Violet (Alexandra Grace Margaret Christine)
Heidi Anne
Ida Francis (Florence Bonnie)
India Alice
Luna (Astrid)
Theadora "Teddy" Juno (Sybil Posy)
Uma Margaret Enid (Kavi Robert Stanley)
Willow Olivia Greenwood (half-sibs: Jemima, Sabrina & Tom)
Zelda Serafima
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.