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:
Alfred Toby Anthony
Axel John James (Athena Joana Lillian)
Cosmo Leopold Jasper
Ethan David Stefan
Harry Michael Charles
Hector James Salusbury (Tallulah Willa)
Hugo Louis Alexander
Lochlan Alexander Ernest (Rafe)
Rupert Louis Christopher (Thomas & Hugh Francis John)
Girls:
Ava May
Caitlin Phillipa Joy
Cara Johanna (Cillian)
Cleo Georgina Emmeline (Max Edward Frederick)
Eliza Jane
Elizabeth Ruby
Florence Hilary Leanne (Sebastian)
Grace Mary Anne
Heidi Lyla May
Lara Juliet (Rowan)
Lyra Jane Christabel Catherine
Madeline Grace Suzette (Scarlett Katherine Florence)
Madeleine Sophie (Annabel Elizabeth)
Pearl Ada (Ralph Harrison)
Romilly Grace Holland (Clio & Felix)
Shoshana Elizabeth (Henrietta)
Winifred Isabella
Twins:
Isla Mary Olga & Ruaridh James Alastair
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.