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:
Alec Lawrence Mìcheal
Alexander Peter Reuben (Beatrice)
Ezaiyah (Aariyana)
Hugo Jonathan Charles
Jack Macaulay Lewis (Mia Madeleine)
Jasper Roman
Leo Robin
Lorcan Francis
Oscar David James (Theodora Serena)
Rory Thomas
Rupert Aubrey Michael (Hugh Cornelius William)
Theodore John
Wilfred Charles (Barnaby Charles)
Girls:
Ada Roisin Kellie
Beatrix Hellene Olivia (Eleanore & Aurelia)
Charlotte Isabella
Eva Piroska
Lucie Annabel (Katie Willow)
Matilda Rose Elizabeth (Felix Nicholas Henry)
Mathilde Helen Virginia (Ralph Laurence Eugène)
Pia Nancy
Twins:
Oscar & Luca
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.