An excerpt from "Sabbath School Net.org" entitled, "Wednesday: Proclaiming God's Name" states: "In the Scriptures, the expression to “call on the name of the Lord” does not only mean to call oneself a follower of the Lord and to claim His promises. It also can mean to proclaim God’s name; that is, to be a witness to others about the Lord and what He has done for the world. Abraham built altars and proclaimed God’s name in the land of Canaan (Gen. 12:8). To Moses on Mount Sinai, God proclaimed His goodness and grace (Exod. 33:19, 34:5). The psalmist calls on the faithful to give thanks to God and call on His name by making known to the nations what He has done (Ps. 105:1). The same words are found in a song of salvation composed by the prophet Isaiah (Isa. 12:4).
Thus, to proclaim the Lord’s name means both to be messengers of the glad tidings that God still rules the world, and also to call on the people of the world to view everything in the context of God’s deeds and character. It also means to tell everyone about God’s generous gift of salvation that is offered to every human being." This article may be viewed at: Wednesday: Proclaiming God's Name/ssnet.org
Reference: Romans 9:17