You said what the week days were named in "the west"... but where in the West? And when?

Latin? British? Gaulish? Really ancient Norse? Proto-Indo-European?

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In Latin, they were named as follows:

• dies Lunae, "day of the Moon"
• dies Martis, "day of Mars"
• dies Mercurii, "day of Mercury"
• dies Iovis, "day of Jupiter"
• dies Veneris, "day of Venus"
• dies Saturni, "day of Saturn"
• dies Solis, "day of the Sun"

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Incidentally, you can see that the Anglo-Saxon terms were mapped on to the Latin, (the day of Tíw, Saxon god of war, is on the day of Mars; the day of Thunor, god of thunder, is on the day of Jupiter; while the day of Frige, the only Goddess who gets a day, is the same day as the day of Venus) . And in fact modern Welsh (also descended from ancient British) is fairly similar to Latin (dydd Llun, dydd Mawrth, dydd Mercher, dydd Iau, dydd Gwener, dydd Sadwrn, dydd Sul).

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We don't really have a lot of texts for what the ancient British called anything much, as pre-Rome there was no writing. Thus, we don't know what they called their days. But it seems very likely that by the time of the Anglo-Saxon invasions, they were using the Latin system, even if not precisely the same words.