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:
Alexander Robert
Archibald Grafton Maybury
Archie Alan
Arthur James Anthony (Arabella Elizabeth Ann)
Frederick "Freddie" Thomas
George Maximilian (Lilianna Lucy & Zara Isobel)
Ludo Ranulph Edwin (Rufus Hugh Grenville & Frederick Milo Theodore)
Mason Vince
Otto William Bear
Oscar Charles
Sam John Wheeler (Coco Jervoise & Eddy)
Theodore Sebastian Phoenix (Maximilian "Maxim" William Wynn)
Girls:
Carys Nell Ruth
Clementine Thea
Clemmie Florence
Constance Edythe
Edith Minnie Emma (Bear & Alfie)
Eleanor Ann
Esther Julia Xanthe (Hera Elizabeth Ingham & Caspar Alexander Vesey)
Gemma Dorothy Rebecca (Lucy)
Georgina Hera Morgan (Harriet)
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.