There are at least four profiles for him:
Ragnar 'Lodbrok' Sigurdsson King of Denmark and Norway (Master Profile)
Ragnar Sigurdsson, Kung av Sverige
King of Denmark and Norway Ragnar "Lodbrok" Sigurdsson
Ragnar Lodbrok Sigurdsson
The main problem is that he *may or may not* be historical, and a lot of stuff has coalesced around him that isn't. There's a long-standing argument over whether or not to declare him Fictional and ignore the contradictions.
There are, *quite intentionally*, multiple profiles for "King Arthur", which can be summed up as "Welsh tradition Arthur", "Geoffrey of Monmouth's Arthur", "Chretien de Troyes' Arthur", "French tradition Arthur", and "Malory's Arthur". Of which, needless to say, "Malory's Arthur" is the best known and most influential. But *all* of them are considered Fictional.
It looks as though we're getting to that point with Rollo/Hrollaug/Gange-Hrolf, except that the one who wound up as Robert I of Normandy was a real person of unknown antecedents and reasonably well known descendants.