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:
Alfie James (Ella Grace)
Arlo Stanley (Roza Grace & Xander Ronnie)
Arthur Anthony Peter (Coco Ava Minnie & Ottilie Elsa Violet)
Constantine Evelio Ernest (Maximilian Nicholas Weatherston)
Finlay David (Marsaili Rose & James Robert)
Frederick Sebastian (Amelie Rose, Hugo Alexander & Mathilde Grace)
Hector Horatio Robert Wijayasiri Barker (Clara Seela Barker & Kitty Sandra Kumari Barker)
Henry John (Alice & Charlotte Rose)
Joseph "Joe" Bobby (Louis Alexander & Molly Tessa Cici)
Lochaidh James Campbell
Ollie Anderson (Jack Alexander)
Quentin Cuthbert Ambrose Cheongho ((Edmund Albert Peregrine Youngho, Prudence Sherry Elizabeth Jihae, Constance Arabella Minhae & Alfred George Leofric Minho)
Theo Jasper (Hugo James)
Girls:
Coco Florence
Grace Elizabeth
Jemima Cecily Urban Hamilton (Cedric Neville Urban Hamilton)
Jozefina Maya
Rosanna Elizabeth Adelaide (Florence Arabella June)
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.