I have omitted any names that I thought were maiden names or otherwise family surnames. Any sibling names listed are in brackets.
It makes me wish I were more adventurous with my own choices; some of these are just fab!
Alexandra Julia (George, Elizabeth)
Alice Charlotte (Harry)
Alice Claire (Annabel, Oliver)
Allegra (James)
Annabel Florence (Camilla)
Annabelle Aoife Mary
Arabella Violet Victoria
Beatrice
Beatrice Beverley Kit
Beatrice Eleanor (Clara)
Charlotte Anne Louise
Charlotte Victoria
Constance Apple
Edith Lucy
Elsa Emmanuel Diana (Alejandro, Javier, Mateo, Gabriel, Monty, Roman)
Emma Ann
Emma Cecily (Madeleine, Isabella)
Erin Louise (Joshua)
Evie Sophia Rose
Florence Mary (Alice, Charlotte)
Frances "Frankie" Amanda Raven (Connie, Benedict)
Francesca Ellen (Isabella)
Honey (Mya)
Honor Nancy (Sebastian)
Indigo Rose Honor (Christabel)
Isla Liberty Rose
Isobel (Hugo)
Jessica Lily
Katherine Alice Evelyn (Henry)
Lola Rose
Louisa Francesca Rose (Max)
Lucy Frances (George)
Maisie Anthea (Reuben, Iris)
Martha Elizabeth Stella (Django)
Molly Jade Isabel
Nancy (Guy)
Olivia Rose
Orla Naomi Florence (Harry, Anna, James, Rachel)
Pia Rose (Poppy)
Poppy Matilda (James, Emily, Rosie)
Rosamund Mamie Catherine (Georgia, Ludo)
Rose Virginie Finovola
Scarlett Alice (Rufus)
Serena Rose (Thomas)
Sophia Mary (Charlie, William)
Willa Rose (Rafferty)
Zara Madeline Daphne Joy (James)
Albert "Bertie" Jonathan Christopher (Beatrice)
Albert Oliver (Poppy, Edward)
Alexander James Henry (William)
Alexander Prosper
Arthur George
Arthur Harry
Arthur Wilfred Shaun
Barnaby Alexander James (Alexa Rose)
Benjamin John (Aimée)
Charles Stephen
Christopher "Kit" Ian (Elodie Rose)
Cuthbert Gerard David
Edward Iain Graham (Christopher)
Edward William
Ethan Craig
Fergus William Donald (Henry, Kitty)
Frank (Bruno)
Frederick Christopher Leslie
Frederick Nicholas (Beatrice)
Fredrik James (Oscar)
George Robert Ranald
Harry John (Izzy)
Hector Robert
Hendrix Roger
Henry Charles Allan William
Henry Michael
Hugh
Humphrey Arthur Edward
Isaac John (Naomi, Sofia)
James David
Joash Simon Hector (Lucy, Mary, Patrick, Alice, Drew)
Lachlan Carlyle
Louis John
Max Stewart
Maximilian Joseph Ghislain
Oliver Francis
Oliver George (Emilia)
Orlando Sebastian (Scarlett)
Oscar Benjamin
Peregrine James (Isla, Sholto)
Ralph Christopher
Reuben Alexander
Samuel James (Joseph)
William Alexander Henry
William Robert Francis (Ava, Rokeby)
Zachary Matthew
Source accessible here.