Final answer:
Abraham Hatfield was the patriarch and leader of the Hatfield clan according to the Hebrew Bible.
Step-by-step explanation:
The patriarch and leader of the Hatfield clan was Abraham Hatfield. According to the Hebrew Bible, Abraham was the first patriarch of the Hebrews and led them away from Mesopotamia around 1900 BCE. He had a son named Isaac and a grandson named Jacob, who were also considered patriarchs.