DSS text (1st century B.C.E.) relays Ham account, uses chet.
Peshir 4QcommGen A, Dead Sea Scrolls
5 And Noah awoke from his wine and knew what 6 his youngest son had done. And he said: Cursed be Canaan, he will be, for his brothers, a slave of slaves! But he did not 7 curse Ham, but only his son, for God had blessed the sons of Noah. And in the tents of Shem he may dwell. He gave the land to Abraham, his beloved... Hebrew text (Ham's and Canaan's name are in bold): תםיםה ויקץ ןוח םייןו וידע את אשר עשה(6) לו בנו הכתו ויומר ארור כנעו עבד עודים יהייה לוחיו ולוא(7) קלל את חם כי אם בני כי ברד אל את בני נוח ובאהלי שם ישכיו (5)