text: A fourth hypothesis—the derivation of the word Edda as the name of Snorri Sturluson's treatise on poetry from the Latin edo, "I compose (poetry)", by analogy with kredda, "superstition", from Latin credo, "creed"—is now widely accepted, although this acceptance might stem from its agreement with modern usage rather than historical accuracy.
  The fifth hypothesis is based on the past fashion of giving Icelandic manuscripts bird titles. Such are the legal codes Grágás 'grey goose', Gullfjǫðr 'gold feather (quill?)', and Hryggjar-stykki 'a kind of duck'. Perhaps Edda was also one of such titles: Edda would be an appropriate 'pet name' of æðr (pronounced as [æ:ðr] f.) 'eider duck'. Then, Edda meant 'little eider duck' (an analog of Grágás).
  The Poetic Edda
  The Poetic Edda, also known as Sæmundar Edda or the Elder Edda, is a collection of Old Norse poems from the Icelandic medieval manuscript Codex Regius ("Royal Book"). Along with the Prose Edda, the Poetic Edda is the most expansive source on Norse mythology. The first part of the Codex Regius preserves poems that narrate the creation and foretold destruction and rebirth of the Old Norse mythological world as well as individual myths about gods concerning Norse deities. The poems in the second part narrate legends about Norse heroes and heroines, such as Sigurd, Brynhildr and Gunnar.
  It consists of two parts. The first part has 10 songs about gods, and the second one has 19 songs about heroes.