The book of Acts presents Jehovah and the Lord Jesus as distinct, and it says that Christians are called out of the nations as a people for his name.
Acts 2:34 David did not ascend to the heavens, but he himself says, ‘Jehovah said to my Lord: “Sit at my right hand until I place your enemies as a stool for your feet.”’
Acts 15:15 And with this the words of the Prophets agree, just as it is written: ‘After these things I will return and raise up again the tent of David that is fallen down; I will rebuild its ruins and restore it, so that the men who remain may earnestly seek Jehovah, together with people of all the nations, people who are called by my name, says Jehovah, who is doing these things, known from of old.’
Additionally it is worth pointing out that the name Jesus itself points to the name Jehovah because it is a theophoric name meaning “Jehovah is salvation”, and that NT authors were aware of this etymology and its significance. (Matt 1:21)
So on each occasion where the NT states the significance of Jesus’ name it is not replacing Jehovah’s name but rather confirming its significance.
Acts 4:10 Let it be known to all of you and to all the people of Israel that in the name of Jesus [Jehovah saves] Christ the Naz·a·reneʹ, whom you executed on a stake but whom God raised up from the dead, by means of him this man stands here healthy in front of you. This is ‘the stone that was treated by you builders as of no account that has become the chief cornerstone.’ Furthermore, there is no salvation in anyone else, for there is no other name under heaven that has been given among men by which we must get saved.”