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:
Archibald Jack Lionel (Isabella Rose Elizabeth)
Arthur William
George Robert
James Peter St Bel
Jude Charles Michael
Lachlan William
Otto Jack (Hugo James, Theo Jasper)
Rory William Fitzwalter
Sebastian
Sidney Robert (Thomas Frederick)
Theodore "Theo" Charles Seán
Vincent Oliver Robin
Wilfred "Wilf" Henry (Paddy)
Girls:
Amelia Grace
Delilah Olive Dulcie (India Ottilie Rose)
Flora Lucy (Harry George)
Florence Elizabeth Alice (Hugo Robert William)
Imogen Sophia Iris (Joshua Yaw & Rory Anthony)
Madeline Elizabeth
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.