I’ve done a fair amount of work on researching the historically-attested Coptic names of the godforms listed in the Z.1 “Enterer of the Threshold” document in Regardie’s The Golden Dawn. You can find my paper “Coptic Names in the Golden Dawn”, which was published pseudonymously in the Summer Solstice 2016 edition of The Hermetic Tablet, here. It is painfully obvious to anyone who has studied even a smattering of Coptic that the names of the godforms used in the original Golden Dawn were hopelessly corrupt, at least as they were handed down to Regardie. I have elected not to provide any attempts at pronunciation for Regardie’s renderings as a result, in cases where there is recourse to scholarly sources. Where I have presented renderings that are not a direct result of my own research, I have cited them below. All of the pronunciations given here are informed by Worrell’s Coptic Sounds, and where there are multiple dialectical spellings of a given name I have preferred the Sahidic dialect. For further information, read the paper linked above.
The Visible Stations – Dais Officers
Imperator: Nephthys – ⲛⲉⲃⲑⲱ (Nebthō)
Praemonstrator: Isis – ⲏⲥⲉ (Ēse)
Cancellarius: Thoth – ⲑⲟⲟⲩⲧ (Thoout)
Past Hierophant: Haroueris – Ϩⲱⲣ ⲟⲩⲏⲣ (Hōr Ouēr)
The Visible Stations – Initiating Officers
Hierophant: Osiris – ⲟⲩⲥⲓⲣⲓ (Ousiri)
Hiereus: Horus – Ϩⲱⲣ (Hōr)
Hegemon: Ma’at – ⲙⲉ (Me)
Kerux: Anubis of the East – ⲁⲛⲟⲩⲡ ⲙ̄-ⲡ-ⲉⲓⲉⲃⲧ (Anoup m-p-eiebt)
Stolistes: Mut – ⲙⲟⲩⲧ (Mout)
Dadouchos: Neith – ⲛⲉⲓⲑ (Neith)
Sentinel: Anubis of the West – ⲁⲛⲟⲩⲡ ⲙ̄-ⲡ-ⲉⲙⲛ̄ⲧ (Anoup m-p-emnt)
The Invisible Stations – Children of Horus
I was able to find no Coptic source for these names other than Regardie; as such, this is the correct pronunciation of the spellings he provides in The Golden Dawn.
Imsety/Amset (Northeast): Ⲁⲙⲉϣⲉⲑ (Amešeth)
Duamutef (Southeast): Ⲧⲱⲩⲙⲁⲑϥ (Tōumathf)
Kebehsenuef (Northwest): Ⲕⲁⲃⲉⲝⲛⲩϥ (Kabeksnuf)
Hapi (Southwest): ⲀϨⲉⲫⲓ (Ahephi)
The Invisible Stations – Kerubim
East/Air: ϩⲁⲑⲱⲣ (Hathōr)
South/Fire (Regardie): Ⲑⲁⲣⲫⲉ-ϣ (Tharphesh)
West/Water: ⲥⲟⲑⲓⲥ (Sothis)
North/Earth: ϩⲁⲡⲉ (Hape)
The Invisible Stations – Evil Persona
Stooping Dragon: ⲁⲫⲱⲫ (Aphōph)
Slayer of Osiris: ⲧⲓⲫⲱⲛ ⲡ-ⲥⲁⲧⲁⲛⲁⲥ (Tiphōn p-Satanas)
Brutal Power of Demonic Force: ⲃⲏⲥ (Bēs)
Mouth of the Power of Destruction (Regardie): Ⲟⲙⲙⲩ-Ϭⲁⲑⲁⲛ (Ommu-Čathan)
The Invisible Stations – Miscellaneous
Harpocrates: ϩⲁⲣⲡⲟⲕⲣⲁⲧⲏⲥ (Harpokratēs)
(N.B.: This is a correction to my earlier work, made possible with the advantage of further resources for research than were available to me at the time of publication.)
The Invisible Stations – Zodiacal Signs
Aquarius: ⲡ-ⲣⲓⲧⲓⲑⲓ (p-Ritithi)
Leo: ⲡ-ⲗⲉⲱⲛ (p-Leōn)
Scorpio: ⲡ-ⲥⲕⲟⲣⲡⲓⲟⲥ (p-Skorpios)
Taurus: ⲡ-ⲧⲁⲩⲣⲟⲥ (p-Tauros)
The Invisible Stations – Cardinal Points
North: ⲡ-ⲙ̄Ϩⲓⲧ (p-mhit)
South: ⲡ-ⲣⲏⲥ (p-rēs)
East: ⲡ-ⲉⲓⲉⲃⲧ (p-eiebt)
West: ⲡ-ⲉⲙⲛ̄ⲧ (p-emnt)