Why are lazy fools in fairy tales called Hans?

hans is German, just like when we tell a joke or a ghost story, we have to have a personal name, which is usually Xiao Ming. Hehe, he is unlucky, and hans is also in his position, which is equivalent to Xiao Ming being a random name in Germany, similar to Zhang San Li Si. Only poor families would call it that in the Middle Ages, just like dogs and cats in China. Hans' German original meaning is a relatively common and humble occupation, just like Germany. Von in a person's name is a symbol of nobility. What von Bauckvon Manstein? They are all nobles.