"The Sword of Elendil was forged anew by Elvish smiths"

The idea of an inherited sword that was reforged for a special purpose may have been influenced by the reforged sword in the Völsunga Saga, used by Sigurd to kill the dragon Fafnir (see bookmark for page 41).  In his operatic adaptation of the legend, Richard Wagner sets the reforging of the broken sword by Siegfried to music:

Listen on Spotify:  The Ring: Siegfried