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
Aubert "Aubie" Matthew Bear
Cameron Gordon
Edward Arthur Oswald (Wilfred Arthur Gelson)
Fergus Charlie John (Molly Jean)
Finan Jude
Finley (Benjamin Ryan)
George James Oliver (William John)
Harry Thomas
Henry Buckland
Hugo Christopher Richard
Jasper William Angus (Edie Roberta Elizabeth)
Leo Charles Hedley
Merlin Ian (Percy Ewing)
Robert Stephen
Steven (Sophia)
Thaddeus Edward Anselm Sooho (Edmund Albert Peregrine Youngho, Prudence Sherry Elizabeth Jihae, Constance Arabella Minhae, Alfred George Leofric Minho & Quentin Cuthbert Ambrose Cheongho)
Theodore Arthur John (Alexander Basil Sylvester)
Thomas Riou Townsend (Dorothy Jane Rosetta)
Girls:
Adeline Joy (Hubert "Bertie" Tom Angus & Daisy Emmanuelle)
Annie Jean
Artemis Flora
Ava Maxwell Ann (Rose Emily Ann)
Ava Willow Kate
Beatrix Katharine Julie (Eliza & Jocelyn)
Clementine Emma Mary
Delphine Perdita Carnelley (Margaux)
Elisabeth Louise Penelope
Elise (Matthew & Celine)
Ella Hilary Marguerite
Everly Rose (Taylor)
Freya Mhairi (Jamie, Juliette & Daniel)
Hallie Ophelia
Honor Posey Nieve (William "Billy" Minto Myles & Clova Isobel Lucia)
Juliette Jean Christine
Lake Chloe Ava
Sienna Poppy (Sadie Florence)
Theodora Elizabeth Ryan (Wilfred)
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.