His name references Erik West, whose internet alias was "Immok the Slayer", a visitor to http://elderscrolls.wikia.com/wiki/Bethesda's HQ during http://elderscrolls.wikia.com/wiki/The_Elder_Scrolls_V:_Skyrim 's development. Bethesda was so impressed with his knowledge of http://elderscrolls.wikia.com/wiki/The_Elder_Scrolls_IV:_Oblivion that they gave him an in depth tour of Bethesda studios and decided to create a character in the name of Erik. Erik died in May 2011 from cancer, before the release of Skyrim.http://elderscrolls.wikia.com/wiki/Erik_the_Slayer#cite_note-0
http://elderscrolls.wikia.com/wiki/Erik_the_Slayer
Sad news, but it seems this was a while back...