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:
Callum Jefferson (Wilbur & Annie)
Fergus George (Wilfred Alexander)
Frederik Michael Eisenhart
Harry Alexander
Ivo Humphrey Maclean
James Albert
Lachlan Miles
Mateo Hezekiah John
Mattias George Le Vaillant (Sophia & Arthur)
Nathaniel Ian Jack
Noah Atkins
Orlando Arthur Magnus
Ovie Angus Hamilton (Hubert & Ziggy Miranda Annie)
Rollo Patrick Linden
Ruaraidh Anthony John
Tobin George Goss (Ava & Arno)
William Granville Christopher Arie (Hugo)
William Samuel
Girls:
Amelie Nuru (Dahlia)
Astrid Florence Merlin (Maximilian Douwe Peter & Audrey Isabella)
Cecily Claire Elizabeth
Georgina Daisy Kathleen Carolyn (Alastair)
Heather Angela Cassandra
Juliet Ella
Iris Katherine (Beatrix & Gus)
Leonora Rose
Leonora Rosemary
Mabel Iris (Evelyn Rose)
Martha Wren
Thea Molly (Maximilian "Max" Wolfe & Isla Rose)
Sorrel Ann Jessie (Innes)
Vaila Gianmarina Fraser
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.