You say after as if there was such a thing as Jewry before Abraham.
Jewish ethnicity did not exist before Abraham. It begins with him and his descendants, first as Hebrews, later as Israelites, and eventually as Jews.
Many scholars associate Abraham with the Amorites, a Semitic-speaking people who migrated from northern Mesopotamia into Syria and Canaan in the early 2nd millennium BCE. This is reflected in both the culture and names described for him in the earliest sources.