With Alexander’s conquest of Babylon, the Greek world adopted the seven-day week, based on the visible planets and named for associated deities.
Babylonian: Shamash, Sin, Nergal, Nabu, Marduk, Ishtar, Ninurta
Greek: Helios, Kallisto, Ares, Hermes, Zeus, Aphrodite, Kronos
Roman: Sol, Luna, Mars, Mercurius, Jupiter, Venus, Saturnus
Nordic: Sun, Moon, Tiw, Wodin, Thor, Freya, Saturn
Modern: Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday
Dept. of nit-picking: how did the Nordics appropriate the Roman god Saturn? He doesn't seem to fit in the Nordic pantheon. Not much contact between Scandinavia and Roman Empire, was there?
That smells tome too, but both of my sources, books on calendars and time had this listed. I will look into it, but perhaps we are counting an adopted Romano-English word as "Nordic."