 Irpa's name does not appear outside of these four attestations, but Þorgerðr also appears in the Prose Edda book Skáldskaparmál, Færeyinga saga, and Harðar saga ok Hólmverja and is mentioned in Ketils saga hœngs.Þorgerðr Hölgabrúðr is particularly associated with Haakon Sigurdsson (d. 995), and, in "Jómsvíkinga saga" and "Þorleifs þáttr jarlsskálds", Þorgerðr and Irpa are described as sisters.The roles of the Þorgerðr Hölgabrúðr and Irpa in these sources and the implications of their names has been the topic of some scholarly discourse and conjecture.