Mirabel Unwin
character in the "St Clare" book series by Enid Blyton
Mirabel
male character in the circa 1621 play The Wild Goose Chase
Mirabel Cotton was a character in L M Montgomery's Anne of Avonlea. A student of Anne's who sat with Dora Kieth.
Mirabella Took was Frodo's maternal grandmother in the Lord of the Rings series by J R Tolkien