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:
Abel Allan (Caleb William)
Archer John (Ava, Ruby & Jacques)
Caspar Leonardo (Edison "Teddy" Arthur)
Cassian Nicolas Bovis
Finley Peter (Ava Grace)
Hugo Christopher David
Lachlan Thomason Bryce (Montgomery "Monty" Mitchell Findlay)
Lawson James (Sienna Grace)
Lewis Arran (Harris, Finn & James)
Max Peter
Maximillian Jensen (Isaac, Thomas, Rupert and Lara)
Maximilian "Max" Rory (Florence Isla)
Rafe Charles Alexander
Rory Wylie
Girls:
Annie Mabel
Clara Lucinda
Constance Penelope Gillian
Ellen Valerie (Harrison Lloyd)
Lucia
Madi Aron
Maggie Jane
Méabh Agnes
Olivia Ella
Phoebe Luisa
Rose Jacqueline
Simran Kaur
Winnie Laurie (Johnny)
Zara (Joseph)
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.