sentences:  The name "Iðunn" has been theorized as the origin of the Old English name "Idonea".19th century author Charlotte Mary Yonge writes that the derivation of "Idonea" from "Idunn" is "almost certain," noting that although "Idonea" may be "the feminine of the Latin "idoneus" (fit), its absence in the Romance countries may be taken as an indication that it was a mere classicalizing of the northern goddess of the apples of youth.