Entries "Æiríkʀ", "Æi-", in: Nordiskt runnamnslexikon (2002) by Lena Peterson at the Swedish Institute for Linguistics and Heritage (Institutet för språk och folkminnen). Entry "EIN" at Nordic Names. Retrieved 19 June 2017.
Entry "Erik" at Nordic Names Wiki. Retrieved 1 February 2013.
Entries "Æiríkʀ", "Æi-", in: Nordiskt runnamnslexikon (2002) by Lena Peterson at the Swedish Institute for Linguistics and Heritage (Institutet för språk och folkminnen). Entry "EIN" at Nordic Names. Retrieved 19 June 2017.
Entries "Æiríkʀ", "Ríkʀ" and "-ríkʀ" in Nordiskt runnamnslexikon (2002) by Lena Peterson at the Swedish Institute for Linguistics and Heritage (Institutet för språk och folkminnen).
In November 2008, there were 20,000 men named Erik in Norway (appr. 0.9% of the male pop.) and 13,000 named Eirik (0.8%). Source: Statistics Norway, http://www.ssb.no/navn/)