While they re-peat what I have read otherwise about the NAME EASTER (its Germanic Pagan roots) there make mistakes as to Easter itself (Bede, who was a Christian Monk, who reports this face as part of English Church history, saw the name for Easter as being unimportant compared to what it was celebrating).
First, while death and resurrection were told of other gods in various legends (and this the story of Christ and his Crucifixion and death do match those stories) the death and resurrection is told in to much details in the Four Gospels (With enough variation of the story to be a retelling of the same event from at least two if not four first hand reports) to be something stolen from one of these pagan stories. The early church probably saw the similarities and used them to convert but that as far as it went.
This report brings up HOW the name of the week came about, but just mentioned Sunday and then apparently gets that wrong. Rome did NOT have a week, it did have a mid month mark (around the 15th of each month, thus the 15th of March is the "Ides of March") and the end of the month mark but that is all. When Constantine adopted Christianity (During the Council of Nicea) he had to adopt the seven day Jewish week, for that is what the Christian church used. Constantine face a problem, worship of the Sun had become quite popular in the 200s and was still popular during Constantine's rule. The Sun worshipers worshiped the sun every 14 days on what we now call Sunday. The Christian Bishops, during the Council of Nicea, decided that since Scripture said that we must keep one out of every Seven days "Holy" it did NOT matter if that "Sabbath" was on Saturday, it could be on another day PROVIDED IT WAS UNIFORMLY APPLIED, i.e to Christian and non-Christians. This Compromise sounded good to Constantine and thus Sunday become our Sabbath.
Now with the adoption of the Week, it was imposed on the Roman Calendar that had been in use since the days of Julius Caesar. The Sun worshipers could still have they every other Sunday to do as they wanted, and the Christian had every Sunday for the same function. This is how Sunday became Sunday.
Now the rest of the week were adopted AFTER the Roman Empire fell in the West. The Germans used a five day week, Monday, for the Moon, Tuesday for Try, the god of the law, Wednesday for Woden or Oden, the German main god of 0-700 AD, Thursday for Thor, the German god of War and the Chief German God after about 600 AD (Thus in English we have Wednesday, but in German it is called, Translated from the German, to "Midweek" for by the time the Germans in what is now Germany adopted Christianity Oden seemed to have disappear from their Mythology). Friday was named for the Goddess Fry, the goddess of grain. With Sunday that made it Six days, then Saturday, after the Roman God Saturn was given the Saturday more to just give it a name then anything else.
For more on Sunday
http://en.wikipedia.org/wiki/SundayFor more on Monday
http://en.wikipedia.org/wiki/MondayFor more on Tuesday
http://en.wikipedia.org/wiki/TuesdayFor more on Wednesday
http://en.wikipedia.org/wiki/WednesdayFor more on Thursday
http://en.wikipedia.org/wiki/ThursdayFor More on Friday
http://en.wikipedia.org/wiki/FridayFor more on Saturday and the only name of the week in English Speaking Country NOT of Germanic origin:
http://en.wikipedia.org/wiki/SaturdayMore on names of the Day of the Week (Including the difference between countries):
http://en.wikipedia.org/wiki/Week-day_namesJust pointing out the problems with this site, I do NOT believe it is intentional, just NOT as accurate as it could be.
One last comment, Easter moves around for it is based on the concept of the "Golden Number", of which you can read more here:
http://en.wikipedia.org/wiki/Computus