1 Corinthians 11:3 But I would have you know, that the head of every man is Christ; and the head of the woman is the man; and the head of Christ is God.
I have no head.
My father is deceased and I moved out of his house anyway at 19.
And I never married.
Ergo, at age 62, Christ is my only head.
Genesis 17:9-11, in my opinion, contains an inclusive "you" which means the whole nation.
It's not that women were left out or ignored or that every woman had a head - they didn't and they don't today.
It's that Abraham's obedience in carrying out God's commands covered the whole nation.