Why is God called by different names in different ages? What are the significances of God’s names?

Relevant Words of God:

You should know that God originally had no name. He only took on one, or two, or many names because He had work to do and had to manage mankind.

Almighty God's Word "Does the Trinity Exist?" | The Church of Almighty God

Almighty God says, "The Spirit within Jesus, the Spirit in heaven, and the Spirit of Jehovah are all one. It can be called the Holy Spirit, the Spirit of God, the sevenfold intensified Spirit, and the all-inclusive Spirit.