From the online Catholic Encyclopedia:
"Good Friday, called Feria VI in Parasceve in the Roman Missal, he
hagia kai megale paraskeue (the Holy and Great Friday) in the Greek
Liturgy, Holy Friday in Romance Languages, Charfreitag (Sorrowful
Friday) in German, is the English designation of Friday in Holy
Week -- that is, the Friday on which the Church keeps the
anniversary of the Crucifixion of Jesus Christ.
Parasceve, the Latin equivalent of paraskeue, preparation (i.e. the
preparation that was made on the sixth day for the Sabbath; see
Mark 15:42), came by metonymy to signify the day on which the
preparation was made; but while the Greeks retained this use of the
word as applied to every Friday, the Latins confined its
application to one Friday. Irenaeus and Tertullian speak of Good
Friday as the day of the Pasch; but later writers distinguish
between the Pascha staurosimon (the passage to death), and the
Pascha anastasimon (the passage to life, i.e. the Resurrection). At
present the word Pasch is used exclusively in the latter sense. The
two Paschs are the oldest feasts in the calendar."
St. Irenaeus pre-dates St. Athanasius by quite a fair number of
years.
Anyway, personally, I can't understand the concept of 'Easter
Sunday is more important than Good Friday'. It is quite alien to
Catholic theology.
regards,
obiterdicta