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:
Apollo Felix
George Patrick
George Philip (Ellie Marie & Imogen Evie)
Henry Robert
James Richard Michael
Joey Jordan (Leo, Sofia Ann & Noah James)
Nile Johnson Micpawroth (Matilda & Hope Merdit Tamali)
Oscar Alexander Francis (Amelie)
Rafe Sebastian Bruce (Margot)
Raphael Ignatius Westgarth (Evangeline Violet Grace & Olive Francesca May)
Robert Arlo Sveaas
Rory James
Rupert Henry David
Thomas Edward
Girls:
Ada Poppy
Amelia Mae
Arianna Michelina Carolina (Charles Thomas Marcellino & Alfred Henry Amerigo)
Aurelia Florence (Nathaniel)
Emily Jennifer (Matilda)
Flora Mary (Thomas Frederick "Tom" & Lily Philippa)
Freida Pamela
Jasmine Rose (Ezra)
Lily Rhiannon Johanna (Thomas, Edward & Poppy)
Marnie Coco
Phoebe James (Theodore James)
Sydney Hanbom
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.