There is several pages of discussion on the topic here: http://www.geni.com/discussions/147132
The general consensus at the moment on Geni is that while it is entirely possible that Ivar and Imar were the same person there is no actual evidence and so there are two profiles.
The wikipedia page for Ivar Boneless is a little mis-leading in that the texts quoted under the heading of Death http://en.wikipedia.org/wiki/Ivar_the_Boneless#Death are quite specifically about Ímar not Ivar.
The wikipedia page for Ímar, deals much better with the question of whether the two men are actually http://en.wikipedia.org/wiki/%C3%8Dmar#Ivar_the_Boneless
So i asked for the suffix to be removed form Ivar's name as no sources exist that state "Ivar the Boneless Ragnarsson was a king in Dublin". We have sources that record "Ingvar/Ivar/Ímar as king in Dublin" and we have lots of people conflating Ímar and Ivar as the same person but that is not the same thing.
Actually if i had been paying more attention at the time i would have asked for the death date, location and burial site to all be deleted from Ivar's profile too as they are all sourced from Ímar. Ivar's death date should display as "after 870" with location and burial blank.