On the eighth day, when they came to circumcise the child, they were going to name him after his father Zechariah.

Genesis 17:12
Generation after generation, every male must be circumcised when he is eight days old, including those born in your household and those purchased from a foreigner--even those who are not your offspring.

Leviticus 12:3
And on the eighth day the flesh of the boy's foreskin is to be circumcised.

Luke 2:21
When the eight days until His circumcision had passed, He was named Jesus, the name the angel had given Him before He had been conceived.

Philippians 3:5
circumcised on the eighth day, of the people of Israel, of the tribe of Benjamin; a Hebrew of Hebrews; as to the law, a Pharisee;

And it came to pass, that on the eighth day they came to circumcise the child; and they called him Zacharias, after the name of his father.