Going along with girlnextdoor there are e two older flood stories the one she listed and that of Atrahasis both written way before the Hebrews wrote their story. The Noah story is almost a complete rip off with only minor changes. Names of the characters and that it was a global flood instead of a more local one. Even the lineage of Adam through to Noah is just a language change. The names are different from the Sumerian kings list but the translation or meaning of each name is the same.
Just about everything in the book of Genesis is a rip off of older Sumerian writings.