Board Thread:Lore Discussion/@comment-67.44.208.243-20170601212340/@comment-2A02:C7D:BF15:9300:64AF:B2E8:6D92:1128-20170806163335

Miraak mentioned Hakon, the Companion that helped defeat Alduin, not Harkon the vampire lord.

Harkon's name is based on an East-Europan name (Harkoni), while Hakon's (just like most Nords) is based on a Scandinavian name (Håkan). Harkon may be a reference to Lutr Harkoni, a vampire lord in the Warhammer series of games.