For the first element Alf- is identical with Old Icelandic alfr, "elf.". The second element -rún is from OW. Norse rún, itself derived from Germanic *rúnó, with an original sense of "secret, hidden knowledge". As a second element -rún should be understood as having the meaning, "she who possesses hidden knowledge". Found in West Scandinavia as a mythological name, and as the Old English name Ælfrun. A short form of names in Rún- or -rún is Runa.