6. How to pronounce G-ds name:[1]

Ad-onoy:[2] When Hashem’s name is written with an Alef Daled [i.e. a-do-nai] then the Alef is to be punctuated by a Chataf Patach [i.e. A-do-nai,אֲ-דֹנָי ] which follows the vowelization of Scripture. [This is in contrast to a regular Sheva “Ido-noy.”]

Havayah – Yud Kei Vav Kei: When Hashem’s name is written “ה-ו-ק-י” some have the custom to pronounce the Alef with a Sheva, saying “Ido-noy” instead of “A-donoy.”[3] However there are those who pronounce it “Ado-noy.” Others however recite it with a Chataf Patach [i.e. A-do-nai,אֲ-דֹנָי ] just as the name written with an Alef Daled is pronounced.[4] [Practically, the custom is like the latter approach.]

Adonaiy or Adononuy:[5] Sephardim say Hashem’s name with a Patach [Ad-onaiy] while Ashkenazim say it with a Kamatz [Adonoiy].

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^[1] Admur 5:2

[2] Admur ibid; M”A 5:1; Bach 5;

[3] Admur ibid; Elya Zutah 5:1; Maharam Melublin 83

[4] Admur ibid; M”A 5:1; Or Chadash 25; Elya Raba 5:2

[5] See Rabbienu Bechayeh Parshas Vayeira; Siddur Yaavetz; Minchas Yitzchak 3:9; 4:47;Teshuvos Vehanhagos 1:154; Moadim Uzmanim 2:170; Yabi Omer 6:11;  Piskeiy Teshuvos 68:5; 685 footnote 92