I don't think the 'Gutenberg' name could be described as a historical inaccuracy, but there is some truth to it. From Wikipedia: Wallau adds, "His surname was

I don't think the 'Gutenberg' name could be described as a historical inaccuracy, but there is some truth to it. From Wikipedia: Wallau adds, "His surname was derived from the house inhabited by his father and his paternal ancestors 'zu Laden, zu Gutenberg'. The house of Gänsfleisch was one of the patrician families of the town, tracing its lineage back to the thirteenth century." Patricians (aristocrats) in Mainz were often named after houses they owned. Around 1427, the name zu Gutenberg, after the family house in Mainz, is documented to have been used for the first time.