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.
Boys:
Atticus Jack
Charles Sebastian
Charlie Michael David
David Charles Adams
Finlay David
Jack John Aitken
Machabee Frank Nicholas Hanuman (Lochlan)
Nicholas Andrew (Martha Clare)
Noah (Nevaeh)
Oliver Thomas
Percival Ralph Julius (Arthur Robert George & Evelyn "Evie" Virginia Rose)
Reuben Andrew
Renzo Damon (Mila Luigina)
Roland Timothy Charles
Sidney
Torquhil James Alexander
William James Ken
Girls:
Abbey Sinclair (Megan Mary)
Annabelle Marina Voase (Arthur Robert William & Hector Peter Frederick)
Aurelia Grace (Isabella)
Bonnie Alexandra
Celeste Marie
Clementine (Patrick)
Eliza Poppy Adorian
Ella Christina
Harper Rose
India Amber Chekkie
Katie Erin (Flora Helen)
Katie Willow
Letizia Rosetta
Maiya
Marina Vere Etta (Nicholas Patrick Adam)
Molly Dorothy
Nora Elizabeth
Octavia Dorothy Alice
Olivia Blake Morningstar
Rose Beatrice Elizabeth (Arthur Charles North)
Skye Philippa Rose
Tallulah Grace
Vesper Ellwood Cecily (Amadeus Dhillon James)
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.