CLAIM: In this passage, God tells Moses that he had not revealed his name (Yahweh) to Abraham, Isaac, or Jacob. But, throughout the book of Genesis, the name of Yahweh is used 162 times, and 34 of these uses are on the lips of the speakers. Critics argue that this is a clear error. In fact, many argue that this is evidence for the JEDP theory of the OT (i.e. mixed sources of the Pentateuch).
RESPONSE: There are multiple possibilities here:
First, some argue that the name was in use, but the meaning was unknown. Charles Gianotti writes, “Though the name YHWH existed well before the time of Moses, the meaning of that name was not revealed until the time of Moses. To understand the meaning of the divine name is to understand the character of God revealed by that name.” For example, imagine if Superman was about to catch an atomic missile and hurl it into space. Before he did this, he might tell Lois Lane: “Now they’re going to see why they call me Superman.” In the same way, God might be saying, “While you’ve heard my name (Yahweh), now you’re going to see why they call me Yahweh.”
Second, some argue that the name was in use before Exodus 6, but the Jews learned of Yahweh in a relational sense. The concept of “knowing” can be a highly relational term, rather than a propositional term (e.g. a man knowing his wife). In this way, perhaps the Jews had heard Yahweh’s name, but they hadn’t come to know him personally. In other words, that believed that Yahweh existed, but they didn’t believe in him.
Third, some argue that Moses retrospectively wrote the name ‘Yahweh’ onto the story of Abraham, Isaac, and Jacob. Since later authors clearly updated names to later cultures,advocates of this view hold that Moses updated the name “Yahweh” onto the lips of the patriarchs –even though they didn’t use this name themselves.
 Kaiser writes, “This would not be the first instance of the use of that name, for already it had occurred some 162 times in Genesis, with 34 of those examples on the lips of speakers in Genesis.” Gaebelein, Frank E. (General Editor), and Walter Kaiser. The Expositor’s Bible Commentary: With the New International Version of the Holy Bible. Vol. Two “Exodus.” Grand Rapids: Zondervan Pub. House, 1984. (“Reinforced by the Name of God 6:1-8).
 Charles Gianotti “The Meaning of the Divine Name” Bibliotheca Sacra (January-March) 1985. 39.
 For instance, the city of Dan (Gen. 14:14), the city of Bethel (Gen. 28:19), and the names of Israelite kings (Gen. 36:31) are anachronistic titles.