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:
Alexander Ferdinand Joseph
Archibald Ian Christopher "Archie"
Bobby Neville (Wesley Oliver)
Cameron Martin (Sofia Lorraine)
Charles Arthur Harry "Charlie" -- "named Charlie in the hopes of a chocolate factory"
Edward James Alan
Finn Nigel
Frederick Guy Augustus
Frederick William Herbert (Arabella Prudence)
George Arthur James (Frederick William Peter)
George Richard (Freddie)
Hamish Robert Russell
Hector Aubrey
Kimball Arthur Bertie
Logan (Freddie)
Ludo
Nico Alwyn (Macsen Wiliam)
Nico Jasper Sidney
Oscar Evren
Patrick
Rafe William Lui (Sebastian)
Rowan Adam Jude
Spencer William (Savannah)
Wolfe Albert Henry
Girls:
Allegra Clementine (Apollo Felix)
Ayah Louise
Clementine
Edith Kay
Francesca Aly
Freya Sema
Josephine Joy Maida
Juniper Betty
Lale-Rose Havva
Lilah Catherine Rose (Tatiana Isla Charlotte)
Olivia (Lilly)
Ottilie Hazel Elizabeth
Persephone August
Winifred Rhona "Winnie"
Xanthe Indira
Zara (Suleman)
Twins:
Katherine & Elisabella
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.