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:
Frederick James Peter
Kit Oliver Morton (Maximilian Guy Michael "Max")
Maximus Simon Parkinson
Theodore William
Wilbur Sebastian David
Girls:
Amelie Rosie Jane (Hugo & George)
Beatrice Sienna Rose (Camilla Martha Octavia)
Charlotte Rosemary
Cicely Jean Sophia (Roberta)
Millie Elizabeth Jane
Mollie Belle
Ruby Rose
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.