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:
Arthur David Tyrrell (William)
Bobby Harris (George)
Charlie Albert
Joseph Michael
Miles Rafe (Mimi)
Nico James Robin (Margot India)
Orlando Joseph Kenneth
Oscar Henry Thomas
Oscar Howard
Samson Andrew Hugh (James)
Sonny Percy Sidney
William Alexander Edward
Girls:
Annabel Rebecca Rose (Jessica)
Cali Joan
Cora Grace
Jiya Chanan (James)
Matilda Helen Ann (Roman Myles)
Matilda Selina
Phoebe (Max)
Media Personality Birth Announcements:
[b] Rufus (Edward, Louis & Hugo) (James Bye)
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.