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:
Aarav Abhishek
Alexander
Ferdinand Dirk
Finn Elias
Jack Rupert William (Lola Sophia)
Miles Alexander
Oliver Erik (Effie Cecilia)
Peter Michael John
Remus Edgar Guy
Sonny Pip (Minnie)
Spencer Byron (Montgomery "Monty" Grant)
Teddy
William Wilfred (Margot)
Girls:
Eva Laetitia
Evelyn May
Inessa Emma Judy
Olympia Jane Annabel
Ophelia Etta Casey
Rosanna “Zanna” Ursula (Ned)
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.