I don't see the necessity since there are plenty of other verses. However 1Jn is a well known interpolation and as written would just as easily support the trinity
Now on "name". Daniel Segraves made an excellent point about name. Names in the bible are personal. They describe something about the person. Jesus is our savior. He is Jehovah salvation.
Name is an idiomatic way of referring to persons. If you speak the name of Jesus you are speaking of that person. (see
Acts 1:15 where the word name is used for persons and
Rev 3:4)
There is One name. There is One Person. In the end of all things God says there will be one Yahweh and His name One
Zec 14:9 And the LORD will be king over all the earth. On that day the LORD will be one and his name one.
Zec 14:9 The Lord will then be king over all the earth. In that day the Lord will be seen as one with a single name.
NET
16 sn The expression the Lord will be seen as one with a single name is an unmistakable reference to the so-called Shema, the crystallized statement of faith in the Lord as the covenant God of Israel (cf.
Deu_6:4-5). Zechariah, however, universalizes the extent of the Lord's dominion--he will be "king over all the earth."