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| I | Book and author | Other notes |
| Ida | Dotty by Erica S. Perl | |
| Idris | The Map of Leaves by Yarrow Townsend | |
| Ilse | Sweet Skies by Robin Scott-Elliot | |
| Imogen | Einstein the Penguin by Iona Rangeley Imogen the Ice Dance Fairy by Daisy Meadows A Clock of Stars: The Shadow Moth by Francesca Gibbons | S |
| Imtiaz | When Secrets Set Sail by Sita Brahmachari | |
| India | India the Moonstone Fairy by Daisy Meadows | S |
| Indigo | Indigo Wilde and the Creatures at Jellybean Crescent by Pippa Curnick | S |
| Irene | Brave Irene by William Steig | |
| Iris | How to Hide a Lion by Helen Stephens Iris and Isaac by Catherine Rayner Flying Scotsman and the Best Birthday Ever by Michael Morpurgo | S |
| Isaac | The Very Helpful Hedgehog by Rosie Wellesley Isaac’s Dreamcatcher by Bonnie Farmer Iris and Isaac by Catherine Rayner Isaac and the Red Jumper by Amanda Seyderhelm The Rhythm of the Rain by Grahame Baker-Smith | |
| Isabel (see also Izzy) Isabella Isobel | Mine! by Hiawyn Oram The Invisible by Tom Percival Love from Alfie McPoonst The Best Dog Ever by Dawn McNiff Isabella the Air Fairy by Daisy Meadows The Girl of Ink and Stars by Kiran Milwood Hargrave The Secret Detectives by Ella Risbridger | ! S ! |
| Isadora | Isadora Moon books by Harriet Muncaster | S |
| Isla | Isla the Ice Star Fairy by Daisy Meadows The Boy Who Fooled the world by Lisa Thompson | S |
| Ivan | By the Light of the Moon by Tom Percival The One and only Ivan by Katherine Applegate | ! |
| Ivor | Ivor the Engine by Oliver Postgate | S |
| Ivy | The Princess and the Frog by Jonathan Langley Ivy the Worry Fairy by Daisy Meadows TrooFriend by Kirsty Applebaum (Ivy is a robot) | S |
| Izzy (see also Isabel) | Izzy the Inventor by Zanna Davidson Izzy the Indigo Fairy by Daisy Meadows Izzy Gizmo by Pip Jones and Sara Ogilvie Izzy’s River by Holly Webb Nothing Ever Happens Here by Sarah Hagger-Holt | S |
Storybook names 