Why is group 8 not called group 8?

Why is it called Group 8? In the rest of the periodic table, the number of the group is the same as the number of outer shell electrons in the atoms of that group. This is not true for the noble gases. Helium only has 2 electrons in its outer shell, while the others all have 8.

every element has 8 electron in outer shell but not in helium because it has 2 electrons

i don't see a text, but i am gonna assume this *orbit* the curved path, usually elliptical, described by a planet, satellite, spaceship, etc., around a celestial body, as the sun.