Names of people, places or organisations are proper nouns.
Your name and my name are proper nouns, and proper nouns are capitalised.
A name refers to the identity of the person and it is often assumed that we know which person is referred to.
The name Jesus was a common name in the Bible and in the time of Jesus.
But when the early Church called upon that name, it refers to Jesus Christ, or Jesus the Anointed One (that is what Christ means)
It was not just a name for identification. It was a name that refers to the person of Jesus Christ.
In calling upon the name of Jesus, it is calling upon His presence, and Jesus will be present with His saving love and power.
That is what Peter meant when he said in the 1st reading: It is faith in that name (Jesus) that has restored this man to health, as you can all see.
May we too see the saving love and power of Jesus as we call upon His Name.
May we make His Name known so that others too will experience the saving love and power of God in their time of need.