God named both the male and female Adam (human), when they were created.
Gen 5:2 Male and female created he them; and blessed them, and called their name Adam, in the day when they were created.
With both the male and female called “Adam”, God called out to Adam, “where are you?”
Gen 3:9 And the LORD God called unto Adam, and said unto him, Where art thou?
Adam was what God called them both. God was not necessarily calling out to only the male Adam and not the female Adam. Adam is the Hebrew word meaning human. You may say that the English contain the words “said unto him”, not “said unto them/ her” but that is a matter of translation choice, not a conclusion you had to reach from the Hebrew text.
Even if God did call only the man – which we cannot know – it is not evidence of male headship, but perhaps of something like Eve coming out of hiding to face God herself while Adam stayed hidden; or God seeing worse motives of Adam’s heart; or any other reason we could or could not imagine. Getting male headship out of this text is putting the things you want to see into scripture, it is not in the words. It is presumptious to speak as if you know God’s motives for asking where the man is.
After sin came into the world, Adam gave Eve another name, Eve. And over the centuries, the church developed the habit of calling only the male by God’s given name, “Adam.” The first woman is, in human convention, called Eve, but that was not God’s name for her.