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 Jacob (Konstancja)
Beau George
Douglas Anthony Byrom
Harry Edward James (Freddie & Sienna)
Louis Leo James
Oliver Jake (Sophie Elizabeth)
Rio David (Caiden Paul, Alba Marie & Sonny Jamie)
Shaan Singh
Girls:
Astrid (Kasper)
Callia Jacqueline Eve
Eleanor Iona
Ottilie Matilda Mary (Wilfred Michael Herbert)
Rosamund Beatrix (Margot Vaughn)
Tallulah Chloƫ Hope
Twins:
Florence & Olive (Martha & Louis)
Triplets:
Archie Nicholas Merry & Lennox Joseph Eion & Ivar James Thomas
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.