All these different spellings - and not just the ones in the title: Kabbalah, Kabbala, Kaballah - there is also Kabala, Kabballah, Kabalah, Kaballa, Kabballa, what shall we make of it?
And then there are the "C" spellings: Cabbalah, Cabbala, Caballah, Cabala, Cabballah, Cabalah, Caballa, Cabballa.
And let us not forget about the "Q" spellings: Qabbalah, Qabbala, Qaballah, Qabala, Qabballah, Qabalah, Qaballa, Qabballa.
There are a total of 24 possible spellings, as in the following table:
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Cabala
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Qabala
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Cabalah
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Qabalah
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Caballa
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Kaballa
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Qaballa
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Caballah
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Kaballah
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Qaballah
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Cabbala
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Qabbala
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Cabbalah
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Qabbalah
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Cabballa
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Kabballa
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Qabballa
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Cabballah
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Qabballah
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First things first, let's consider the first-letter choices. "C" (as in Cabbala, Cabala, etc.); or "K" (as in Kabbalah, Kabala, etc.); or "Q" (as in Qabala, Qabalah, etc.).
Some pundits posit as a general guideline, i.e., not 100% of the cases, that whereas Jews spell it with a "K" (Kabbalah, etc.), Christians tend to use a "C" (Cabala, etc.) while the occultists tend towards the "Q" (Qabalah, etc.).
Next, to consider the last not last, is the question of the final "H" (as in Cabalah, Kabbalah, Qabalah, etc., but not in Cabala, Kabala, Qabbala, etc.).
This variation is usually a reflection of pronunciation practices, so here I'll stick to Jewish orthography. The word has three syllables. The final "H" (Kabbalah, etc.) is to induce you to emphasize the final syllable, while its omission (Kabala, etc.) leads to middle syllable stress.
Speaking of middle, doubling the "b" (Kabbalah, etc.) or not (Kabala, etc.) and/or doubling the "l" (Kaballah, Kabballah, etc.) or not (Kabbalah, Kabalah, etc.) is also a manifestation of the effort to invoke correct pronunciation, in this case the three short "a" vowels as well as correct syllable stress. I refuse to elaborate further, as the theories here are inconsistent and even contradictory.
As for Kosher Kabbalah (Kosher Kabbala, Kosher Kaballah, Kosher Kabala, Kosher Kabballah, Kosher Kabalah, Kosher Kaballa, Kosher Kabballa), in this case it is probably safe to drop the "C" and "Q" options according to the above principle, because the term 'kosher' can be applied only to authentic Jewish Kabbala (Kabbalah, Kabala, etc.). Anyway, look how silly it would be to have "cosher cabala" or "qosher qabalah"!
This does not mean that every "K" internet site or print book is authentic; far from it. Only a few are. Many if not most kosher Kabbalah websites can be found on our links page and the English version books on our reading lists. But at least you know that the chances are better than on any of the "C" (Cabbalah, Cabbala, Caballah, Cabala, Cabballah, Cabalah, Caballa, Cabballa) or "Q" (as in Qabbalah, Qabbala, Qaballah, Qabala, Qabballah, Qabalah, Qaballa, Qabballa) sites.
Oh yes, about the main spelling variations based on pronunciation difference. As I mentioned above, this variation is usually a manifestation of accent distinctions, with the final "H" indicating emphasis on the final syllable, while its omission leads to middle syllable stress. I think it is safe to say that the latter (Kabbala, Kabala, Kaballa, etc.) reflects the Ashkenazic Jewish manner of pronounciation, while the former (Kabalah, Kabbalah, Kaballah, etc.) indicates the Sephardic way.
But for kosher Kabbalah (Kosher Kabbalah?, Kosher Kaballah?, Kosher Kabala?) sites and books, how they spell it and how you pronounce it are of virtually no significance. What counts is that for the product to be kosher, the Kabbalists (Cabbalists, Cabalists, Qabbalists, Qabalists) or whoever is producing it have to be impeccably kosher themselves, faithful to the unbroken chain of Jewish traditional teachings since the Mount Sinai revelation.

137 = The Hebrew word קבלה (Kabbalah) has a Gematria (numerical value) of 137. In Modern Hebrew, the root of Kabbalah ק-ב-ל can mean either "receiving" or "parallel". Kabbalah is generally taken to mean "the received tradition", which conveys the continuity of a tradition that has been passed down from generation to generation.Nevertheless, the earlier nuance of meaning is seen in the first appearances of its root in the Torah (Exodus 26:5 and 36:12), where it means "parallel" or "corresponding" rather than "receiving". It is used to describe the "corresponding loops", which, when clasped together, enjoined the two sections of the Tabernacle's ceiling. These loops were suspended directly over the veil that divided the Holy Place and the Holy of Holies. Symbolically, this is the threshold between the physical dimension and the utterly spiritual dimension. In other words, at the boundary line of the physical world, the number 137 emerges. The wisdom of Kabbalah is to find correspondences