1 Cor 12:4-6 is written in parallelism:
4. There are different gifts, but the same Spirit.
5. There are different ministries, but the same Lord.
6. There are different ways of working, but the same God works all things in all people.
*** 1) Does triplet represent three names for the Holy Spirit as "Spirit", "Lord" and "God" – 2) If not what does it mean?
A cogent case cannot be made to support the trinity or Holy Spirit as "Spirit", "Lord" and "God".
I Corinthians 12:4-6 does not explicitly states that the three are one, some have taken it to imply such a connection. This is another one of these peculiar verses that people latch on to, but in my opinion has no substance.
Paul mentioned the Father and Jesus in every introduction never the Holy Spirit of every letter he wrote (Romans 1:7; 1 Corinthians 1:3; 2 Corinthians 1:2; Galatians 1:3; Ephesians 1:2; Philippians 1:2; Colossians 1:2; 1, Thessalonians 1:1; 2 Thessalonians 1:2; 1 Timothy 1:2; 2 Timothy 1:2; Hebrews 1:1-2), but he never mentioned the Holy Spirit.
Lord
Lord was used loosely, masters, kings, chiefs, pious people etc... the scribers decided when it should be used with a capital not God or Jesus.
1 Kings 18:7 - As Obadiah was walking along, Elijah met him. Obadiah recognized him, bowed down to the ground, and said, “Is it really you, my lord Elijah?”
(not only calling Elijah lord but also bowing down – in respect not worship)
God does not philosophize and speak all the way around matters. He doesn't beat around the bush. He speaks clearly and in no uncertain terms so that there can be no doubt as to what He meant. If God was indeed a Trinity why would He not simply just come out and say so, just as clearly and decisively as He does when He speaks about his uniqueness?
The LORD said to my Lord, "Sit at my right side, until I make your enemies into a footstool for you."
(we have 2 lords – all capital and ‘L’)
The Lord your God is God; he is the faithful God, keeping his covenant of love to a thousand generations of those who love him and keep his commands.
— Deuteronomy 7:9
Matthew 4:10
"Away from Me, Satan!" Jesus declared. "For it is written: 'Worship the Lord your God and serve Him only.'
(we have God referred to Lord – only capital ‘L’)
Genesis 18:12
Therefore Sarah laughed within herself, saying, After I am waxed old shall I have pleasure, my lord being old also?
God
There is no need to be abstract, God or Jesus could have easily clarified this, but nothing said by God or Jesus implies trinity.
The following are clear as to how the Jews understood God
Deuteronomy 4:39
"Know therefore this day, and consider it in thine heart, that the LORD he is God in heaven above, and upon the earth beneath: there is none else."
Or Isaiah 43:10-11:
"Ye [are] my witnesses, saith the LORD, and my servant whom I have chosen: that ye may know and believe me, and understand that I [am] he: before me there was no God formed, neither shall there be after me. I, [even] I, [am] the LORD; and beside me [there is] no saviour."
Or Zechariah 14:9:
"And the LORD shall be king over all the earth: in that day shall there be one LORD, and his name one."
Or Isaiah 45:18
For thus says the LORD, who created the heavens (he is God!), who formed the earth and made it (he established it; he did not create it empty, he formed it to be inhabited!): “I am the LORD, and there is no other.
Or Isaiah 45:6
that they may know from the rising of the sun, and from the west, that there is none besides me: I am Jehovah, and there is none else.
Or Isaiah 44:6
Thus says LORD JEHOVAH, the King of Israel, and his Savior, LORD JEHOVAH of Hosts his Name: “I AM The First and I AM The Last, and there is no god outside of me
Or Isaiah 45:22
Look unto me, and be ye saved, all the ends of the earth; for I am God, and there is none else.
Or Exodus 20:3
Thou shalt have no other gods before me.
Or Exodus 34:14
(for thou shalt worship no other god: for Jehovah, whose name is Jealous, is a jealous God);
No mention of any Holy Spirit or trinity
Spirit / Holy Spirit
The Holy Spirit or Spirit are not a divine person and are used in different context.
The spirit is the Divine Power of God, that God uses, to help and guide his servants Gods Holy spirit / guidance / knowledge / strength / force / influence etc…
Isaiah 11:2–3 - "The Spirit of the LORD shall rest upon him, the Spirit of wisdom and understanding, the Spirit of counsel and might, the Spirit of knowledge and of the fear of the LORD, and He will delight in the fear of the Lord."
(the above clarifies very clearly)
Psalms 34:18 - The LORD is close to the brokenhearted and saves those who are crushed in spirit.
(clearly Lord and spirit are not the same)
1 Peter 3:19 19 After being made alive, he went and made proclamation to the imprisoned spirits
Luke 24:37-39 - 37But they were startled and frightened, thinking they had seen a spirit. 38“Why are you troubled,” Jesus asked, “and why do doubts arise in your hearts? 39Look at My hands and My feet. It is I Myself. Touch Me and see—for a spirit does not have flesh and bones, as you see I have.”…
(Jesus says he is not a spirit – even though Jesus was conceived with the HS and received the HS when baptised)
Matthew 22:30 - For when the dead rise, they will neither marry nor be given in marriage. In this respect they will be like the angels in heaven.
Luke 20:36 Neither can they die any more: for they are equal unto the angels; and are the children of God, being the children of the resurrection.
(when you die you become a spirit)
some say the below passages – Advocate & Spirit of Truth are the Holy Spirit
John 16:13 - When the Spirit of truth comes, he will guide you into all the truth, for he will not speak on his own authority, but whatever he hears he will speak, and he will declare to you the things that are to come.
John 14:26 - But the Advocate, the Holy Spirit, whom the Father will send in My name, will teach you all things and will remind you of everything I have told you.
John 16:7 - 7But I tell you the truth, it is for your benefit that I am going away. Unless I go away, the Advocate will not come to you; but if I go, I will send Him to you.
(if the advocate and spirit are HS – why does Jesus (Lord or God) need to go away before it comes, when HS before Jesus, when he was conceived and when baptised)
1 Timothy 4:1
Now the Spirit expressly states that in later times some will abandon the faith to follow deceitful spirits and the teachings of demons,
(is the HS / Lord / God – also deceitful?)
More detailed explanation of the Holy Spirit: https://hermeneutics.stackexchange.com/a/74548/33268
For completeness - I will briefly cover some other passages / points
God is two
John 1:1 - In the beginning was the Word, and the Word was with God, and the Word was God.
See: https://christianity.stackexchange.com/q/84384/47775
John 8:58
Jesus said to them, “Very truly, I tell you, before Abraham was, I am.”
See: https://hermeneutics.stackexchange.com/a/60969/33268
2 Corinthians 13:14
14 May the grace of the Lord Jesus Christ, and the love of God, and the fellowship of the Holy Spirit be with you all.
See: https://hermeneutics.stackexchange.com/a/55482/33268
God is three
1 John 5:7
King James Bible
For there are three that bear record in heaven, the Father, the Word, and the Holy Ghost: and these three are one.
• New Living Translation
So we have these three witnesses—
• English Standard Version
For there are three that testify:
• American Standard Version
And it is the Spirit that beareth witness, because the Spirit is the truth.
• Contemporary English Version
7 In fact, there are three who tell about it.
The text quoted does appear in the Kings James Version but has been omitted by most of the editors of the recent versions e.g. Revised Standard Version, New American Standard Bible, New English Bible, Phillips Modern English Bible, because the quoted text does not appear in the older Greek manuscripts.
Some quotes:
Renowned historian Edward Gibbon calls the addition a "Pious Fraud" in his famous history book `Decline and Fall of Roman Empire'.
According to Newton, this verse first appeared for in the third edition of Erasmus's (1466-1536) New Testament.
Peakes commentary on the subject reads; "The famous interpolation after "three witnesses" is not printed even in RSVn, and rightly. It cites the heavenly testimony of the Father, the logos, and the Holy Spirit, but is never used in the early trinitarian controversies. No respectable Greek MS contains it. Appearing first in a late 4th-cent. Latin text, it entered the Vulgate and finally the NT of Erasmus."
Oxford Companion to the Bible we read:
"The earliest New Testament evidence for a tripartite formula comes in 2 Corinthians 13.13, where Paul wishes that 'The grace of the Lord Jesus, the love of God, and the communion of the Holy Spirit' be with the people of Corinth. It is possible that this three part formula derives from later liturgical usage and was added to the text of 2 Corinthians as it was copied…"
Richard Porson who also proceeded to publish devastatingly conclusive proof that the verse of 1 John 5:7 was only first inserted by the Church into the Bible in the year 400C.E.(Secrets of Mount Sinai, James Bentley, pp. 30-33).
The Interpreter's Dictionary of the Bible, Vol. 4, p. 871, Abingdon Press.
"1 John 5:7 in the Textus Receptus (represeted in the KJV) makes it appear that John had arrived at the doctrine of the trinity in explicit form ('the Father, the Word, and the Holy Ghost'), but this text is clearly an interpolation since no genuine Greek manuscript contains it"
Others, such as the late Dr. Herbert W. Armstrong argued that this verse was added to the Latin Vulgate edition of the Bible during the heat of the controversy between Rome, Arius, and God's people.
The scripture translator Benjamin Wilson gives the following explanation for this action in his "Emphatic Diaglott." Mr. Wilson says:
"This text concerning the heavenly witness is not contained in any Greek manuscript which was written earlier than the fifteenth century. It is not cited by any of the ecclesiastical writers; not by any of early Latin fathers even when the subjects upon which they treated would naturally have lead them to appeal to its authority. It is therefore evidently spurious."
Gospel of John: see https://hermeneutics.stackexchange.com/a/63568/33268
What does this passage mean
Very difficult to confirm what pauls intention was as with many other things he says, pausl teachings are hard to understand and often conflict with Jesus’s teachings see links below for more detail.
https://hermeneutics.stackexchange.com/a/62976/33268
https://hermeneutics.stackexchange.com/a/74491/33268
There is also the issue of the scribes changing / manipulating / corrupting the text;
Jeremiah 8:8
“‘How can you say, “We are wise because we have the word of the LORD,” when your teachers have twisted it by writing lies?