Esau's Wives in Genesis 36:1–3
Genesis 36 names Adah first in its list of Esau's wives, but the passage does not say she was his earliest wife. The list identifies Esau's household and its Canaanite and Ishmaelite ties, not a marriage chronology.
Esau's Wives in Genesis 26:34–35
Genesis 26:34–35 names two Hittite women Esau married at forty and states plainly that they grieved his parents. The fuller biblical picture comes when Genesis 36 lists his wives again.