My partner recognized it and describes it as "Scandinavian fruit knife".

Picture and description (in German):
http://fahrtenmesser-handgemacht.de/Fahrtenmesser_handgemach...

Everything else on the list is real, too:
https://www.egmnow.com/articles/news/battlefield-v-reveals-e...
Melee weapons include the jack knife, club, cricket bat, hatchet, kukri, pickax, scout knife, shovel, and Solveig knife.

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Note added at 1 day 15 hrs (2018-10-04 22:04:44 GMT)
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Perhaps I explained this badly:
My partner, who is a (real) knife collector, recognized the name "Solveig knife" when said it WITHOUT ANY CONTEXT. Since jack knife, kukri, and scout knife are also real knives, I think that it is in line with these. Could not find more online references (not surprisingly since the knife trade is often word-of-mouth), but my theory is that it is the "Norwegian version" of a Puuku or Mora knife. These are small "everyday knives".
https://en.wikipedia.org/wiki/Mora_knife

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Note added at 2 days 6 hrs (2018-10-05 13:46:44 GMT)
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The protagonist of a story within the game is named Solveig, but I doubt that it is only used by her. You've probably noticed that the historical aspects of the weapons and storylines are a major part of the game.

https://www.vgr.com/battlefield-v-nordlys-war-story-revealed...
As the trailer revealed, Battlefield V Nordlys War Story is the story of a young Norwegian Resistance fighter during the German occupation.

https://www.reddit.com/r/BattlefieldV/comments/9iel54/nordly...
Nordlys war story protagonist is named "Solveig," Appears to hold Norwegian Krag–Jørgensen

Detailed item lists. Unfortunately, no description of the Solveig knife.
https://www.vg247.com/2018/10/02/battlefield-5-all-vehicles-...
https://gamefragger.com/multiplatform/first_person_shooter/b...
https://rankedboost.com/battlefield-5/best-classes/

https://www.pcgamesn.com/battlefield-v/battlefield-v-weapons
Battlefield V is going to be jam-packed with all sorts of period-authentic weapons, vehicles, and military equipment.

https://www.reddit.com/r/BattlefieldV/comments/9dlqp7/i_actu...
I actually have one of the knives from the game
[BRITISH ARMY JACK KNIFE]

Anyway, the Solveig knife should be a Scandinavian-style paring knife for small tasks, not a combat knife or fantasy blade. May also help:
https://en.wikipedia.org/wiki/Sami_knife
The Sami people typically use two knives; the smaller one can be called a buiku, puukko or unna niibaš ( "small knife" ), while the larger "Sami knife" is called stuorra niibi ( "big knife" ).

Take a look at this knife. The Kukri and British Army knife are also on the list of knives from WWI/II.
http://trueantiques.co.uk/folder20th-21stcenturyincww1ww2/kn...
Norwigian Toten Knife
Early 20th century traditional Norwegian Totan Knife.
The sheath is made from cow horn in a metal frame and the handle is either laminated cow horn or laminated birch bark.
8.5cm blade
19cm long. 23cm with scabbard