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:
Daniel Jacob (Thomas)
Douglas Giles Montgomery (Barnaby Rupert Zebedee)
Felix
Frederick Thomas Fairfax (Horatio)
Guy Alban Arnold
Hector Edward Jude (Archer George Edmund)
Hugo Tyrrell Lawrence
James Scott Fionn
Luca Edward Apsley (Leo Robert Rokeby & Maxwell "Max" Felix Bower)
Max Roy
Noah Afi McGlew (Milo Jean McGlew)
Theodore Albert Edward
Thomas Alexander Annesley (Henry James Weston)
Girls:
Amaryllis Oriana Clio (Lysander Atticus Zeno)
Ava May
Cecily Rose (Hugh James Porter & Charles Richard Francis)
Cora Diana
Eilidh Margaret (Ruairdh Iain)
Etta Miranda Alabama (Inigo Harvey Ghislain & Viola Florence Ghislaine)
Grace
Huxley Dorothy Marston (Herbert Barnaby Richard)
Ottilie Rose Jean
Tullia Teodora Bliss (Lelio)
Úna Murphy
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.