Terminology
Norse religion was a cultural phenomenon, and — like most pre-literate folk beliefs — the practitioners probably did not have a name for their religion until they came into contact with outsiders or competitors. Therefore, the only titles bestowed upon Norse religion are the ones which were used to describe the religion in a competitive manner, usually in a very antagonistic context. Some of these terms were hedendom (Scandinavian), Heidentum (German), Heathenry (English) or Pagan (Latin). A more romanticized name for Norse religion is the medieval Icelandic term Forn Siðr or "Old Custom".
Read more about this topic: Norse Religion