Who are her members?
Gentiles: Nations- sinners whom the LORD has redeemed to God out of every tribe, nation, and tongue- Revelation 5:9, 10?

By what name she is called?
Just as in a traditional wedding, the bride takes the name of the husband, so here, prophetically, it is declared that the church, as the bride of Christ, would be given a new name (i.e. her married name, as in Christ’s church, or the church of the Redeemed ones). She is here spoken of in the singular ‘Thou’ although she is made up of many members that the Father chose, and Christ redeemed, and the Spirit has called and is yet calling out. In Revelation 21:9 she is called Christ’s body, and the bride, the Lamb’s wife. These have been loved from eternity and for eternity, and is built on a covenant that can never be broken by the LORD Himself- John 17:23,24. What love! What unconditional love! I John 4:10. Christ, her living head, most certainly and definitively purchased her, in a way of strict justice, with His most precious blood. Although having been born with the maiden name of sinner, she is now called by a new name…’RIGHTEOUS,’ v. 2 (Him who is thy Righteousness). V. 12, the effect of the LORD Jesus’ death is that the church is called Holy, Redeemed and Not Forsaken.

Regardless of the earthly denomination, the one common denominator that every one of the LORD’S redeemed ones share is that HE sought them in the lost ruins of sin and the fall, and although HE found them in a most miserable and damnable condition, YET, He calls them by ‘a new name’ and their sins and iniquities, neither He nor His Father, can/shall ever remember any more- For I will be merciful to their unrighteousness, and their sins and their iniquities will I remember no more, Hebrews 8:12

Who is her founder and maker?
‘Which the mouth of the LORD shall name’ Whosever name the bride bears speaks to the glory of the One who has taken her to Himself. While many women today are keeping their maiden names, so as not to have to change back when the marriage goes awry, and the spouse has not been what he pretended…’to have and to hold so long as we both shall live,’ such is not the case with the LORD Jesus. He has been faithful unto death, and He ever lives now to intercede on behalf of His own, Hebrews 7:25.