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:
Barnaby Frederick James (Alexandra Beatrice, Jemima Antonia & Francesca Rose)
Cosmo Albert Piers
Dean Micheal
Edward Harry Buchanan
Felix Rafael Maximus (Leo James Glenn)
Magnus Dominic Titus (Imogen Frances Mary)
Rocco Spencer Joseph
Rory Robert (Sadie Rachel; half sibs: Polly & Nell)
Sam Henry
Sebastian Robin
Suleman Hassan Tayyeb
Girls:
Alexia Genevieve (Hubert James Raphael, Beatrice Elizabeth, Emilia, Leo, Helena Adelaide & Matilda Agnes)
Cora Caton
Cosima Annabel Edith
Emilia Ellis Hermance (Alexandra Beverley Catharine)
Evelyn Rebecca Jayne
Freya "Effie" Blake Grace
Hilma Iona (Astrid Isla)
Isla Elizabeth
Jasmine
Margot India
Reenie May
Romy Beatrix Alma
Sienna Wyn
Twins:
Barnaby David Thoma & Henry Joseph Thomas (Ottilie Wanda Petal)
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.