Real structure of Viking names
Norse people didn't use fixed surnames but patronymics: Erik's son was called Eriksson (son of Erik), his daughter Eriksdóttir (daughter of Erik). Bjorn Ironside literally means 'Bjorn son of Ragnar, called Ironside'. This system followed paternal lines exclusively.
Nicknames (kennings) described achievements or characteristics: Harald Hårfagre (Fair-Hair), Ivar the Boneless (possibly due to bone disease), Erik Bloodaxe (self-explanatory). A fiction mistake is inventing unfounded nicknames: 'the World Destroyer' sounds modern, 'the Shield-Breaker' is authentic because it describes a specific combat technique.
For accurate historical fiction, combine common names (Olaf, Sigurd, Gunnar) with real patronymics and earned nicknames. Lagertha appears in Saxo Grammaticus's chronicles as a real warrior, not TV invention. Female names ended in -fríðr (beautiful), -hildr (battle), -rún (secret): Gunnhildr, Ástríðr, Sigrun.
Differences between raiders, traders and settlers
The word 'viking' was a verb (fara í víking = to go raiding), not an ethnicity. Most Norse were farmers; only 5-10% participated in raids. The drengir (young warriors) sought fame; the kaupmaðr (traders) peaceful wealth; settlers in Iceland or Greenland never raided.
This affects names: a Swedish trader in Constantinople would adopt Christian names (Harald became Harold), an Icelandic settler maintained pure Norse tradition. Leif Erikson was a peaceful explorer, not a warrior. His father Erik the Red was exiled for murder, explaining his nickname.
For worldbuilding, consider the role: a berserker (battle-trance warrior) would have a fierce nickname ('the Bear', 'the Wolf'), a skald (poet) something refined ('Silver-Tongue', 'Verse-Maker'). Egil Skallagrímsson was both: brutal warrior AND the best poet of his era. Vikings were complex, not caricatures.
Norse mythology in personal names
Many names invoke deities: Thor-stein (Thor's Stone), Frey-dis (Frey's Woman), Ing-var (Ing's Warrior). Others refer to totemic animals: Bjorn (bear), Ulf (wolf), Orn (eagle). Compounds were creative: Asbjorn (divine bear), Thorolf (Thor's wolf), Sigurd (victory + guardian).
Common mistake: mixing pantheons. Norse didn't mix Greco-Roman names with theirs. Names like 'Odin the Zeus of the North' are modern inventions without historical basis. Odin himself rarely appeared in personal names (considered dangerous to invoke the All-Father directly); Thor was more common as protector.
Mythological valkyries had descriptive names: Gunnr (battle), Hildr (combat), Skögul (furious). These were recycled for real girls. If writing Norse fantasy, study the Poetic Edda and Prose Edda for authentic names. Snorri Sturluson (13th century) preserved thousands of usable kennings.
Using Norse names in modern RPGs
In Dungeons & Dragons or Skyrim, Norse names communicate cultural heritage. Frequent mistakes: overusing 'ø' (rare in Old Norse), inventing impossible endings (-throk, -gorn), mixing Viking Age (793-1066 AD) with late medieval names.
For memorable NPCs, follow historical patterns: name + patronymic + earned nickname. 'Thorstein Eriksson the Ice-Breaker' works better than 'Ragnarok Destroyer'. Players remember nicknames referring to campaign feats: if a PC kills a dragon, they might earn 'Ormsbanir' (Serpent-Slayer).
Assassin's Creed Valhalla did solid work mixing documented names (Sigurd, Basim) with plausible-sounding invented ones. A trick: use authentic suffixes (-sson, -dóttir, -bjorn, -ulf) with invented roots. 'Hrefnar Bjornsson' sounds Norse even though 'Hrefnar' isn't documented. Avoid impossible Old Norse consonants (the 'x' didn't exist, for example).