The Feast of the Most Holy Name of Mary is the 12th September.
The feast originated in Spain and was approved by the Holy See in 1513. Innocent XI extended its observance to the whole Church in 1683 in thanksgiving to our Lady for the victory on September 12, 1683 by John Sobieski, king of Poland, over the Turks, who were besieging Vienna and threatening the West.
Reverence is extended for the Blessed Virgin Mary and her name. The Catholic Encyclopedia explains that "we venerate the name of Mary because it belongs to her who is the Mother of God, the holiest of creatures, the Queen of heaven and earth, the Mother of Mercy.... The feast commemorates all the privileges given to Mary by God and all the graces we have received through her intercession and mediation."
The name Mary is rooted in various ancient languages: in Hebrew Myriam; in Aramaic Maryam; in the Greek Old Testament, Mariam; and in Greek and Latin New Testament, Maria.
Of course, the name “Mary,” being the name of the Blessed Mother, deserves special respect and devotion, and is thereby celebrated in four ways:
First, Mary is a name of honor, since the faithful praise Mary as the Mother of our Divine Savior; she is rightfully called “Mother of God,” for Jesus true God, second person of the Holy Trinity entered this world becoming also true man through Mary who had conceived by the power of the Holy Spirit.
Second, Mary is a most holy name, because the very mention of her name reminds us she is full of grace, has found favor with God, and is blessed among all women.
Third, Mary is a maternal name, because she is our Mother, whom our Lord gave to us as He was dying on the cross (cf. John19:26-27).
Finally, Mary is a name of the mother who responds to all our needs, protects us from evil, and prays “for us sinners now and at the hour of our death.”
The Most Holy Name Of Mary:
Holy Mary, Mother of God,
pray for us sinners now
and at the hour of our death. Amen.
This litany, reflecting the nature of the feast, is for private devotion.
Prayer:
Lord, have mercy.
Lord, have mercy.
Christ, have mercy. Lord, have mercy.
Son of Mary, hear us.
Son of Mary, graciously hear us.
Heavenly Father, of Whom Mary is the Daughter, have mercy on us.
Eternal Word, of Whom Mary is the Mother, have mercy on us.
Holy Spirit, of Whom Mary is the spouse, have mercy on us.
Divine Trinity, of Whom Mary is the Handmaid, have mercy on us.
Mary, Mother of the Living God, pray for us
Mary, daughter of the Light Eternal, pray for us
Mary, our light, pray for us
Mary, our sister, pray for us
Mary, flower of Jesse, pray for us
Mary, issue of kings, pray for us
Mary, chief work of God, pray for us
Mary, the beloved of God, pray for us
Mary, Immaculate Virgin, pray for us
Mary, all fair, pray for us
Mary, light in darkness, pray for us
Mary, our sure rest, pray for us
Mary, house of God, pray for us
Mary, sanctuary of the Lord, pray for us
Mary, altar of the Divinity, pray for us
Mary, Virgin Mother, pray for us
Mary, embracing your Infant God, pray for us
Mary, reposing with Eternal Wisdom, pray for us
Mary, ocean of bitterness, pray for us
Mary, Star of the Sea, pray for us
Mary, suffering with your only Son, pray for us
Mary, pierced with a sword of sorrow, pray for us
Mary, torn with a cruel wound, pray for us
Mary, sorrowful even unto death, pray for us
Mary, bereft of all consolation, pray for us
Mary, submissive to the law of God, pray for us
Mary, standing by the Cross of Jesus, pray for us
Mary, Our Lady, pray for us
Mary, Our Queen, pray for us
Mary, Queen of glory, pray for us
Mary glory of the Church Triumphant, pray for us
Mary, Blessed Queen, pray for us
Mary, advocate of the Church Militant, pray for us
Mary, Queen of Mercy, pray for us
Mary, consoler of the Church Suffering, pray for us
Mary, exalted above the angels,
Mary, crowned with twelve stars, pray for us
Mary, fair as the moon, pray for us
Mary, bright as the sun, pray for us
Mary, distinguished above all, pray for us
Mary, seated at the right hand of Jesus, pray for us
Mary, our hope, pray for us
Mary, our sweetness, pray for us
Mary, glory of Jerusalem, pray for us
Mary, joy of Israel, pray for us
Mary, honor of our people, pray for us
Mary, Our Lady of the Immaculate Conception, pray for us
Mary, Our Lady of the Assumption, pray for us
Mary, Our Lady of Loreto, pray for us
Mary, Our Lady of Lourdes, pray for us
Mary, Our Lady of Fatima, pray for us
Mary, Our Lady of Czestochowa, pray for us
Mary, Our Lady of the Miraculous Medal, pray for us
Mary, Our Lady of Mount Carmel, pray for us
Mary, Our Lady of the Angels, pray for us
Mary, Our Lady of Dolors, pray for us
Mary, Our Lady of Mercy, pray for us
Mary, Our Lady of the Rosary, pray for us
Mary, Our Lady of Victory, pray for us
Mary, Our Lady of La Trappe, pray for us
Mary, Our Lady of Divine Providence, pray for us
Lamb of God, Who takes away the sins of the world, spare us, O Lord Jesus.
Lamb of God, Who takes away the sins of the world, graciously hear us, O Lord Jesus.
Lamb of God, Who takes away the sins of the world, have mercy on us, O Lord Jesus.
Son of Mary, hear us.
Son of Mary, graciously hear us.
I will declare your name unto my brethren.
I will praise you in the assembly of the faithful.
Let Us Pray (Oremus)
O Almighty God, Who beholds Thy servants earnestly desiring to place themselves under the shadow of the name and protection of the Most Holy Virgin Mary, grant, we beseech You, that by her charitable intercession, we may be delivered from all evil on earth, and may arrive at everlasting joys in Heaven, through Jesus Christ Our Lord. Amen.
From: www.catholicstraightanswers.com, ucatholic.com and www.catholicculture.org