Possible Clues:

• Language used in Cameroon or Senegal
• Like Hagar
• Like the origin of the names for some days of the week
• Medieval Scandinavians
• Of ancient Scandinavia
• 'Oh damn their Celtic twilight,,' Peter thought. 'Thank God I'm —' (Eric Linklater, White Maa's Saga)
• Resident of Oslo
• Language of Nag's Head replacing that of its general classification
• Like Thor or Frigg
• Language ''Viking'' came from