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Old Norse word mánadagr comes from Swedish dag, Swedish måne (A moon.), Proto-Germanic *mēnô (The moon.)
dag (Swedish)
A day. A day, the period of time between sunrise and sunset, daytime.
måne (Swedish)
A moon.
*mēnô (Proto-Germanic)
The moon.
dies lunae (Latin)
*mēniniz dagaz (Proto-Germanic)
Monday.
mánadagr (Old Norse)