Answer
Marcos adopted the name Subcomandante Insurgente Galeano in honor of his fallen comrade, who was killed by Mexican federal forces. Galeano was a founding member of the Zapatista Army of National Liberation (EZLN), and his death was a major blow to the movement. Marcos chose to adopt Galeano's name as a way to honor his memory and to continue the struggle for indigenous rights and autonomy in Mexico.