 The name Iðunn appears as a personal name in several historical sources and the Landnámabók records that it has been in use in Iceland as a personal name since the pagan period ( 10th century ) . Landnámabók records two incidents of women by the name of Iðunn ; Iðunn <unk> , the daughter of an early settler , and Iðunn <unk> @-@ <unk> , granddaughter of one of the earliest settlers recorded in the book . The name Iðunn has been theorized as the origin of the Old English name Idonae . 19th century author Charlotte Mary Yonge writes that the derivation of Idonae from Idunn is " almost certain , " noting that although Idonae may be " the feminine of the Latin <unk> ( fit ) , its absence in the Romance countries may be taken as an indication that it was a mere <unk> of the northern goddess of the apples of youth . " 
