Trinitarian advocates like to use Isa. 9:6 to prove Jesus is God because of the use of Mighty God and Everlasting Father.
“For to us a child is born, to us a son is given; and the government shall be upon his shoulder, and his name shall be called Wonderful Counselor, Mighty God, Everlasting Father, Prince of Peace.”
Trinitarians are not really consistent. They will tell you themselves that they do not believe Jesus is the eternal Father, but the eternal Son. It just goes to show that they too would argue that this name should not be taken in a strict literal sense.
Nor does the verse prove Jesus is the Father for the Oneness Pentecostals. There are many who bore names that included the word God (Heb. El or Yah). Eliab means “My God Father”; Jehoram means “Yahweh Exalted”; Ithiel means “God with Me”; and Isaiah means“Salvation of Yahweh.”
Furthermore, in the bible a human being can be called “God” if he represents God to the people. Moses was God to Pharoah (Ex. 7:1). In Ps. 45:6-7, Solomon refers to someone as God (“Therefore God, your God…”). The judges of Israel are called Gods (Ps. 82:6), and Jesus brought this to the Pharisees attention when THEY accused him of calling himself God.
Having a name or title does not necessarily describe the person. However, we do know for sure there is only one true God and that is the Father. (Isa. 64:8; Jer. 10:10; John 17:3)