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The Annunaki were most likely the same beings referred to in Genesis 6 and elsewhere in the Bible as the Sons of God (i.e., Fallen Angels).

The best explanation of this is found in the ancient Book of Enoch (Enoch I/Ethiopian Book of Enoch). It's online in text form for free. I just looked for a pdf of it and found this (Enoch I pdf). I haven't checked this source out carefully, but, from a quick scan, it looks good.

BTW, Book of Enoch fragments were found in the Dead Sea Scrolls and the Book was considered highly regarded by various religious communities (Jewish and early Christian) at that time.

Here's what ChatGPT has to say about the Book of Enoch and R.H. Charles (1855–1931), its translator. The manuscript that Charles translated Book was written in Geʽez. Geʽez (sometimes referred to in scholarly literature as Classical Ethiopic) is an ancient South Semitic language. The language originates from what is now northern Ethiopia and Eritrea.

R.H. Charles is renowned for his translation and scholarly work on it. The Book of Enoch, also known as 1 Enoch, is an ancient Jewish religious work that was known to the early Church Fathers but was largely lost to Western Christianity until its rediscovery in the late 18th century.
Here is a brief overview of the significant points regarding the Book of Enoch and R.H. Charles's involvement:
Rediscovery of the Book of Enoch:
In the late 18th century, European scholars became aware of the Book of Enoch through Ethiopian manuscripts.
In 1773, the Scottish explorer James Bruce returned from Ethiopia with three copies of the Ge'ez manuscript of the Book of Enoch.
Translation and Scholarship:
The first English translation was made by Richard Laurence in 1821, from an Ethiopian manuscript.
R.H. Charles, a British biblical scholar, produced a highly influential translation in 1893. His work included not only a translation but also extensive commentary and critical apparatus, which made the text accessible to a broader academic audience.
Charles's translation was based on multiple manuscripts and took into account the growing body of scholarly work on the text.
Significance of R.H. Charles's Work:
Charles's translation and commentary were critical in bringing the Book of Enoch to the attention of biblical scholars and the wider public.
His work highlighted the importance of the Book of Enoch in understanding the development of Jewish and early Christian thought, particularly its influence on New Testament writings.
R.H. Charles's contributions were seminal in the academic study of the Book of Enoch, making him one of the key figures in the modern understanding and appreciation of this ancient text.
Subsequent Discoveries
Dead Sea Scrolls:
The Dead Sea Scrolls, discovered between 1946 and 1956, included Aramaic fragments of the Book of Enoch, which confirmed the antiquity and textual history of the work. These discoveries postdated Charles's work but have since provided additional context and validation for the study of Enochic literature.