Spell Checks and Sacraments

In a certain RC Church nestled in the Hills and Hollows of Arlington Mass, the Advent Missal renders the hymn "The First Noel" as "The First Nowell".
For one brief shining moment I thought Archbishop O'Malley had been forced to lay off his proof-readers in the local religious recession, turns out though "The First Nowell" is a legit Old English form of the title.
Of course, what a local Catholic Church is doin' pretentiously using Old English in its Missal, I'll never know.