Coincidences mean nothing. Looking deeper into the motivations of Breivik and Anders, their overall goals aren't alike. Anders was a victim of a corrupt institution that has legitimately been oppressing his people for a thousand years. He was bereaved and guilt ridden with what he did, and had a voice in his head pressing him into the actions he took.
Breivik's fears were baseless and spawned from irrational xenophobia.
Anders also targeted the symbol of his oppression. Breivik... targeted children.
And as said earlier. This is insulting and belittling to Brevik's victims and their families making a joke of his actions.
Sure! Except Breivik saw himself as a modern day Knight Templar (Pauperes commilitones Christi Templique Solomonici) doing God's work by stopping his country from falling to the evils of Islam.
So the motivations behind his actions have absolutely nothing in common with Anders the fictional videogame character (DA2 Anders was fighting against religious extremists under a totalitarian regime; not FOR religious extremists in a democratic country).
Sadly, had Breivik been named Ludovik, or any other name, the parallel would never have been drawn to begin with.