Adam called Eve woman because she was taken out of man. In Genesis 2:23, Adam says, "This is now bone of my bones and flesh of my flesh; she shall be called 'woman,' for she was taken out of man." This is a reference to the creation story in Genesis 2, where God creates Eve from Adam's rib while he sleeps. The name "woman" reflects the fact that she was created from man and is of the same nature as him, but also signifies that she is distinct from him as a separate and complementary being.