'Eighth' in the Bible

It happened that on the eighth day they came to circumcise the child [as required by the Law], and they intended to name him Zacharias, after his father;

And God gave Abraham a covenant [a formal agreement to be strictly observed] of [which] circumcision [was the sign]; and so [under these circumstances] Abraham became the father of Isaac, and circumcised him on the eighth day; and Isaac [became the father] of Jacob, and Jacob [became the father] of the twelve patriarchs.

And the beast that [once] was but is not, is himself also an eighth king and is one of the seven, and he goes to destruction (perdition).

the fifth, sardonyx; the sixth, sardius; the seventh, chrysolite (yellow topaz); the eighth, beryl; the ninth, topaz; the tenth, chrysoprase; the eleventh, jacinth; the twelfth, amethyst.