 The name Iðunn has been variously explained as meaning " ever young " , " rejuvenator " , or " the rejuvenating one " . As the modern English alphabet lacks the eth ( ð ) character , Iðunn is sometimes anglicized as Idun , Idunn or Ithun . An -a suffix is sometimes applied to denote femininity , resulting in forms such as Iduna and Idunna . 
