What are the Meaning of the names of the days in a week?

Answer 1

In Roman times, the days of the week were named after the 7 visible planets (the Sun and the Moon were in those days considered planets). We have vestiges of this in English: Sunday, Monday, and Saturday are named after the Sun, the Moon, and Saturn. The names of the other four days got modified by replacing the names of four Roman gods with their Teutonic equivalents: Mars -> Tiw, Mercury -> Wotan, Jupiter -> Thor, and Venus -> Frigg/Freyja. It should be fairly obvious how those original names got worn down into the modern versions.