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 Robert Penrose
Alfred "Alfie" Adrian
Benjamin Peter
Hamish Alexander (Oscar & Sophia)
Henry Peter
Jude Tom
Milo William
Oliver Blake Anthony
Reece Noel
Theodore Richard Kemp
Thomas William (Maxwell Xavier & Eleanor Vivian)
Tobias Malcolm Banks (Hamish Walter John & Rupert Michael Samuel)
Girls:
Alexandra Grace Margaret Christine
Aliya (Aleena)
Allegra Iris Jane
Eleanor Loveday Stephanie
Honor Ruth Flip (Leodora Rosemary Faith)
Lana
Matilda Rose
Poppy Elizabeth
Stella Aino
Sybilla Eliza Juliet
Twins:
Atticus Alexander & Darcy Aurelia
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.
