I just added the character Gierrodur, and found that there is already a Geirrodur (note the first two vowels are switched). Apparently Marvel switched the spelling of the name somewhere along the line. In Thor vol. 1:210 he is repeatedly named as Gierrodur, but I found him in the marvel glossary as Geirrodur.
Original Marvel universe, the marvel universe deluxe edition and several Thor comics have him as Geirrodur! One issue of Thor referencing him with his name spelled with a Gi instead of a Ge doesn't outweigh all other references to him. Plus there is already a page on him with his name spelled correctly...Geirrodur. If you have anything to add you should add it to that page.