Why in x men first class why did Eric change his name to magneto?

In "X-Men: First Class," Eric Lensherr adopts the name Magneto as a symbol of his transformation from a victim of prejudice into a powerful figure who embraces his mutant identity. After witnessing the atrocities of humanity, particularly during the Holocaust, he resolves to protect mutants at any cost and to harness his abilities for what he sees as a righteous cause. The name "Magneto" reflects his control over magnetism and signifies his commitment to leading mutants against the oppression they face. This change marks his shift from a Survivor to a militant advocate for mutant rights.