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:
Aston
Felix William
George Marc (Isabel)
Jack John Huxley (Margot Ines & Olivia Alexandra)
Jack Oliver
Jasper Alexander (Evelyn Violet)
Jasper Roman Jenner
Rafe Étienne Frederick (Wilbur Francis Marriot, Margot Mary & Thomas Rémi Patrick/"Zachary")
Rollo Orson (Octavia & Otto)
Theodore "Theo" (Freddie)
Thomas Charles (James & Emily)
Girls:
Chloe Nadine Emily (Nina)
Hebe Heather Margaret (Orlando)
Helena "Nell" Florence
Marina Sophie Beatrice (Henry Ferdinand Balthazar & Alice Leonora Céleste)
Matilda Judith
Phenie Amber Rose
Ruby Cornelia
Tallulah Elspeth (Coco Florence)
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.