User blog comment:MCWWolf359/asgard mothership/@comment-4859352-20150222165445

I think both of them.

1st theory: "Bilskirnir", as I see is too close to original (Old Norse pronunciation & spelling of Asgard word) and "Biliskner" is more anglicized/americanized.

2nd theory: Also "Bilskirnir" is the name of ship-class and "Biliskner" is the name of particular ship, commanded by Thor.