Counting Archangels

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The earliest reference to a system of seven archangels as a group appears to be in Enoch I (the Book of Enoch) which is not part of the Jewish Canon, where they are named as Gabriel, Michael, Raphael, Uriel, Raguel, Remiel and Saraqael. While this book today is non-canonical in most Christian Churches, it was explicitly quoted in the New Testament (Letter of Jude 1:14-15) and by many of the early Church Fathers. The Ethiopian Orthodox Church to this day regards it to be canonical.(c)

...Eastern Orthodox Tradition mentions "thousands of archangels"; however, only seven archangels are venerated by name...
...еvery Monday throughout the year is dedicated to the Angels, with special mention being made in the church hymns of Michael and Gabriel.(с)

The Eastern Orthodoxy tradition venerates Gabriel, Michael, Raphael, Uriel, Selaphiel, Jegudiel, and Barachiel.
Another variation lists them corresponding to the days of the week as: St Michael (Sunday), St Gabriel (Monday), St Raphael (Tuesday), St Uriel (Wednesday), St Sealtiel (Thursday), St Jegudiel, (Friday), and St Barachiel (Saturday).
According to Rudolf Steiner, four important archangels also display periodic spiritual activity over the seasons: Spring is Raphael, Summer is Uriel, Autumn is Michael, and Winter is Gabriel. (c)

The traditional prayer to one's guardian angel

This is the traditional Catholic prayer to one's guardian angel.

Angel of God, my guardian dear
to whom God's love commits me here.
Ever this day/night be at my side
to light, to guard, to rule and guide.
Amen.

In Latin:

Angele Dei,
qui custos es mei,
me, tibi commissum pietate superna,
illumina, custodi,
rege et guberna.
Amen.

An Eastern Orthodox prayer to the Guardian Angel:

O Angel of Christ, my holy Guardian and Protector of my soul and body, forgive me all my sins of today. Deliver me from all the wiles of the enemy, that I may not anger my God by any sin. Pray for me, sinful and unworthy servant, that thou mayest present me worthy of the kindness and mercy of the All-holy Trinity and the Mother of my Lord Jesus Christ, and of all the Saints. Amen.
(c)