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:
Cooper James
Gabriel William
George Edward
Henry
Henry Michael Francis
Ivor Thomas Nicholas
James Alexander Fantarrow
Maximilian Nicholas Daniel (Isabella Iris Margaux)
Mungo George Wilson
Oscar Paul Michael
Percy Ludo Yerburgh
Rhys Peter
Rory William (Oliver)
William Lindsay Ross
Girls:
Alexandra Marianne Isabella
Florence Isabella Ophelia (Araminta Florence Cressida)
Freya Rose (Isla Rose)
Lily Niamh
Nola Belle
Persephone May
Pippa (Hugo Charles Noel & George Bernard Noel)
Serena Emily Jane (Cressida Molly Muriel)
Twins:
Zoe Elise & Nina Johanna (Maja Charlotte)
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.