The Akkadians in the northern cities of Sumer were a different people than the Sumerians of the southern cities. They were a semetic people. The Sumerians were not a semetic people. Ur of the Chaldes was a Sumerian city. That’s where Abrahams father was from. That’s what it says in the bible. And he left Ur at the time of Ur’s fall.
No one knows what language Abram’s father spoke.
For what it’s worth:
The term “Semitic” refers to a family of languages that includes Akkadian, Hebrew, Aramaic, and Arabic, among others. Abram and his family are associated with the Hebrew language, which is part of the Semitic language family.
Biblical Lineage:
According to the Bible, Abram is a descendant of Shem, one of Noah’s sons. The term “Semitic” itself is derived from Shem. This lineage places Abram within the broader category of Semitic peoples.
Cultural and Ethnic Identity:
The Bible situates Abram and his family within the broader cultural and ethnic context of the Semitic peoples. They are depicted as part of the migratory Semitic groups that moved through Mesopotamia and the Near East.
More of the same (FWIW):
Abram, who is later named Abraham, is a direct descendant of Shem. According to the genealogies in the Bible, Abram is the tenth generation from Noah through Shem. The genealogy is outlined in the Book of Genesis, specifically in chapters 10 and 11. Here is the lineage from Shem to Abram:
Shem:
Arphaxad (Shem’s son)
Shelah (Arphaxad’s son)
Eber (Shelah’s son)
Peleg (Eber’s son)
Reu (Peleg’s son)
Serug (Reu’s son)
Nahor (Serug’s son)
Terah (Nahor’s son)
Abram (Terah’s son)
Thus, Abram is the great-great-great-great-great-great-great-grandson of Shem. This lineage places Abram within the Semitic line, linking him to the broader heritage of the Semitic peoples.