..God greatly exalted him and bestowed on him the name that is above every name, that at the name of Jesus every knee should bend, of those in heaven and on earth and under the earth, and every tongue confess that Jesus Christ is Lord, to the glory of God the Father. (Philippians 2:9-11)
Jesus is the Church. He is The Truth. The Way and The Light. He is at the heart of everything. Here is an article on the background of the feast:
“The veneration of the Holy Name was encouraged by the example of St. Bernard of Clairvaux but the greatest promoters of this devotion were St. Bernardine of Siena and his follower St. John Capistrano. “They carried with them on their missions in the turbulent cities of Italy a copy of the monogram of the Holy Name, surrounded by rays, painted on a wooden tablet, wherewith they blessed the sick and wrought great miracles. At the close of their sermons they exhibited this emblem to the faithful and asked them to prostrate themselves, to adore the Redeemer of mankind.” (Catholic Encyclopedia)
The practice of showing the monogram of Jesus over gates and above doors largely begins with their exhortations. In the sixteenth century the Holy Name was introduced as a liturgical feast. In the year 1530 Pope Clement VII first permitted the Order of Friars Minor to celebrate the Name of Jesus with its own proper Office.”
Read the entire article, Jesus: The Name Above all Names.