7 planets & 7 days of the week.

How is it that independent countries throughout the world, who developed their culture and language independent to one another named their seven days after the same seven planets?
sources : How the Days of the Week Received Their Names by Spencer McDaniel. Link : https://talesoftimesforgotten.com/201...
Wikipedia : Names of the days of the week. Link : https://en.wikipedia.org/wiki/Names_o...