Adi

Adi (devanāgarī: आदि, ādi) is a Sanskrit word meaning "first, beginning, primeval." It is frequently use to talk about the primordial buddha (Adi-Buddha), primordial wisdom Adi Buddhi, the primeval ancient one Adi Sanat, the first cause Adi-Nidana,, adi-shakti (primeval force),

Âdi is the generic name in our Doctrine of all the first men, i.e, the first speaking races, in each of the seven zones––hence probably “Ad-am.” And such first men, in every nation, are credited with having been taught the divine mysteries of creation.

As suggested in the previous quote, Blavatsky asserts that the name "Adam" for the first man comes from a root used universally in different traditions:

The words Ad and Adi mean in Sanskrit “the first”; in Aramæan, “One” (Ad-ad, “the only one”); in Assyrian, “father” whence Ak-Ad or “father-creator.” And once the statement is found correct it becomes rather difficult to confine Adam to the Mosaic Bible alone, and to see therein simply a Jewish name.

ÂDI TATTVA, the primordial universal Force, issuing at the beginning of manifestation (or creative period) from the eternal immutable SAT, the substratum of ALL. It corresponds with the Auric Envelope or “Brahmâ’s Egg,” surrounding every globe, as every man, animal and thing. It is the vehicle containing potentially everything––Spirit and Substance, Force and Matter. It is Âdi Tattva that we refer to in Esoteric Cosmogony, as the Force which proceeds from the First or Unmanifested Logos.