The Sunday in Christmastide which is between the Octave of Christmas and the Feast of the Epiphany is the Feast of the Holy Name of Jesus in the Extraordinary Form of the Roman Liturgy. When there is no such Sunday (this occurs when Jan. 1, Jan. 6, or Jan. 7 are Sundays), the feast is celebrated as a 2nd class feast on Jan. 2. It was originally celebrated in the Franciscan calendar as a special feast. Its celebration was extended to the universal Church by Pope Innocent XIII in 1721.
Ant. In the Name of Jesus let every knee bow: in Heaven, on Earth, and under the Earth: and let every tongue confess that the Lord Jesus Christ is in the glory of God the Father.
V. O Lord, our Lord: how admirable is Thy Name in all the earth!
V. Glory be…
Ant. I shall praise Thee, O Lord my God, with my whole heart, and I shall glorify Thy Name forever: for Thou, O Lord, art sweet and mild, and plenteous in mercy to all that call upon Thee, alleluia.
Ant. All the nations Thou hast made shall come and adore before Thee, O Lord, and they shall glorify Thy Name: for Thou art great, and dost wonderful things: Thou art God alone. Alleluia.