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:
Albie Matthew (Riley Matthew) -- Dad is Matthew
Archer Rowley
Clement Andrew Seymour
Finn Francis Midelfart
Henry James
Henry Michael Jan (Frederik Willem Jacob & Charlotte Henriette Lucy)
Henry Rupert (Camilla)
Jasper Whincup Robert (Hector Albert Whincup)
Jayden William (Jacob Michael)
Max (Flora & Toby)
Orson Iraj (Astrid Eva)
Otto Daniel Apollo (Henry & Arthur)
Remi
Rory John
Rudy Robin Desmond (Eva)
Theodore Anton Cecil (Jozefina Maya)
Theodore "Theo" Bruin Figueroa
Theodore Wolf St Clair
Wilbur Riley
Girls:
Alice Annabel
Arabella May
Charlotte Lilly Grace (Emilia)
Emilia Artemis (Alexander Atticus)
Flora Mima Charlotte (Rosy Elizabeth Joy)
Lily Thea Kathleen
Phoebe Violet
Tabitha Mary
Willow Isabelle Liliwen (Francesca)
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.