magneto: testament was very powerful. you can tell it was well-researched, and it interspersed historical fact with max’s story. though i’m still confused about magneto’s name, but that’s not the story’s fault, that’s because i haven’t read an x-men comic since 1999. the form was also excellent. the artist gave the characters a lived, realistic shape. the layout, often limited to rigid-like grids, not unlike the death camps, sometimes burst out of the limiting format to punctuate certain moment, often moments of symbolic significance. but it’s a hard, hard read. it hurts, but it’s supposed to hurt. you can’t read about a story that passes through one of the worst periods in human history and not hurt.
As far as the name goes, there’s a lot that is implicitly obvious.
"Erik Lehnsherr" is a name that was at some point in the ’90s established as false in comics history, one Mags created at the point he was trying to look for Magda. He picked "Erik" when he did so as a homage to his uncle Erich; he used "Magnus" as a middle name for the proximity to his own real name.
He stopped using Max Eisendhardt altogether because Max, in a way, died there. It’s a way to cope with survivor’s guilt.