Tuesday is a day of the week occurring after Monday and before Wednesday. According to some commonly used calendars (esp. in the US), it is the third day of the week. According to international standard ISO 8601, however, it is the second day of the week.

The English name is derived from Old English Tiwesdæg and Middle English Tewesday, meaning "Tīw's Day", the day of Tiw or Týr, the god of single combat, victory and heroic glory in Norse mythology.

Tuesday: This day was named after the Norse god Tyr (A god of war).

Monday: The name comes from the Anglo-Saxon monandaeg, "the moon's day". This second day was sacred to the goddess of the moon.

Wednesday: The day named to honor Wodan (Odin).

Friday: The day in honor of the Norse goddess Frigg.

More Info: en.wikipedia.org