Who was the God of the ancient Hebrews?

The name of God most often used in the Hebrew Bible is the Tetragrammaton (YHWH יהוה‬). It is frequently anglicized as Jehovah and Yahweh and written in most English editions of the Bible as "the Lord" owing to the Jewish tradition viewing the divine name as increasingly too sacred to be uttered. It was thus replaced vocally in the synagogue ritual by the Hebrew word Adonai (“My Lords”), which was translated as Kyrios (“Lord”) in the Septuagint, the Greek version of the Hebrew scriptures.

Rabbinic Judaism describes seven names which are so holy that, once written, should not be erased: YHWH and six others which can be categorized as titles are El ("God"), Eloah ("God"), Elohim ("Gods"), Shaddai (“Almighty"), Ehyeh (“I Will Be”), and Tzevaot ("Hosts").