Board Thread:Questions and Answers/@comment-2.218.215.241-20131020132815/@comment-76.69.79.67-20170228112419

The Japanese language version clearly pronounces it as 'Egiru' (short e), not 'Ægiru' or 'Agiru'. Therefore, there's a play on words at work here, not just portmanteau. Furthermore Skallagrimsson was of tall stature, wields an axe (although common to many Varangians), was a trader, farmer and poet. Although I can't be certain how far the parallels go because I haven't read the prose edda.

It should be included as a note in the trivia, but that was removed. Do as you please, but the information is incomplete in its current form.