Episode titles in this series are usually taken from pop song titles or lyrics, however there are no singles matching "Not All Who Wander Are Lost" for title or lyrics. There are three artists associated with this title: album title in 2001 for American virtuoso mandolinist Chris Thile, a song title for heavy metal band Devil Driver from their 2007 album The Last Kind Words (never made into a single), and a song title for folk/Americana singer-songwriter Lana Del Ray from her 2021 album Chemtrails Over the Country Club (also not released as a single). It's first referenced in the second line of J.R.R. Tolkien's poem "The Riddle of Strider" written for The Fellowship of the Ring, with the addition of the word "those" after "all". This episode's title could have been taken from any of these.