The Son of Elohim claims the name Arche, which is originally from Gen 1:1, (LXX).
The Arche of Creation is basically the same as "the Head", (as Paul says in Col 1:18).
Colossians 1:18 W/H
18 και αυτος εστιν η κεφαλη του σωματος της εκκλησιας ος εστιν [η] αρχη πρωτοτοκος εκ των νεκρων ινα γενηται εν πασιν αυτος πρωτευων
Colossians 1:18 T/R
18 και αυτος εστιν η κεφαλη (the head) του σωματος (of the body) της εκκλησιας (of the congregation) ος εστιν αρχη (who is Arche) πρωτοτοκος εκ των νεκρων ινα γενηται εν πασιν αυτος πρωτευων
18 And he is himself the head of the body of the congregation, who is Arche, firstborn from the dead: that in all things he might have the preeminence.
We know that the one who speaks to Yohanan in the Apocalypse and tells him to write, (concerning all of the seven congregations in Asia), is the Son of Elohim, (not "a son of Elohim" but "THE Son of Elohim", with the article, so there is no doubt).
Revelation 2:18
18 And to the messenger-angel of the congregation in Thyatira, write: Thus says the Son of Elohim, who has the eyes like a flame of fire, and his feet like unto burnished brass:
Then the Son of Elohim says this in the following passage:
Revelation 3:14 W/H
14 και τω αγγελω της εν λαοδικεια εκκλησιας γραψον ταδε λεγει ο αμην ο μαρτυς ο πιστος και [ο] αληθινος η αρχη της κτισεως του θεου
"η αρχη της κτισεως του θεου" = "the Arche of the creation of Elohim"
Moreover he says:
Revelation 22:13 W/H
13 εγω το αλφα και το ω ο πρωτος και ο εσχατος η αρχη και το τελος
13 I am the Alpha and the Omega, the Protos and the Eschatos, the Arche and the Telos.
However Genesis 1:1, in the Septuagint, (as well as John 1:1), has no article with Arche:
Genesis 1:1 LXX-Septuagint
1 εν αρχη εποιησεν ο θεος τον ουρανον και την γην
1 IN ARCHE Elohim made the heavens and the earth.
Perhaps it is not so much "what" is (the meaning of) arche? but rather, "who" is Arche?
And according to Col 1:18 the Head of the body of the congregation is Arche, (no article also here, in most manuscripts and codices, as the W/H puts the article in brackets and the T/R and Byzantine text types do not have the article with Arche in that passage). And if these things be true then the Head of the body of the congregation is named in Genesis 1:1 and all things were made in-through-with-by-way-of him, (εν), and for him, (Adam).