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:
Adrian (Josh, Ellie & Jacob Patrick)
Algernon "Algy" Kit
Angus George Theodore Hamilton (Margot Clementine Russell & Hector Albert Louis)
Inigo James Alexander (Ophelia Grace Scott, Leonora Olympia Rose & Algernon Arthur William)
Jasper (Ralph)
Leo Yuto Stephen (Kai)
Maximilian Alexander
Rupert Robert (Edward David)
Thomas William (Eliza Florence)
Girls:
Alice Camilla (Oscar & Jack)
Aurelia Ida (Ottilie Emily)
Idina Claire Rosamund (Oswin William Frederick)
Isla Katherine (Nathaniel & Edward)
Isobel Gwynneth (Elliott Gomer)
Marla Petria (Thomas "Tommy" Ethan & Joe Peter)
Rose Elizabeth Dorah (Isla Margaret)
Sky Indica
Zoe Robyn (Stella)
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.