Etymology
Amen, meaning so be it, is of Hebrew origin[6][7]. The word was imported into the Greek of the early Church from the Jewish synagogue.[2][8]. From Greek, amen entered the other Western languages. According to a standard dictionary etymology, amen passed from Greek into Late Latin, and thence into English.[9]
The Hebrew word ’amen derives from the Hebrew verb ’aman, a primitive root.[10] Grammarians frequently list ’aman under its three consonants (’mn), which are identical to those of ’amen .[9] This triliteral root (’mn) means to be firm, confirmed, reliable, faithful, have faith, believe. Two English words that derive from this root are:
a. amen, from Hebrew ’amen (=truly, certainly); b. Mammon, from Aramaic mamona, probably from Mishnaic Hebrew mamôn, probably from earlier *ma’mon (=? “security, deposit”).
Both a and b derive from Hebrew ’aman (=to be firm).[11]
The Talmud teaches homiletically that the word Amen is an acronym for אל מלך נאמן (’El melekh ne’eman, "God, trustworthy King"),[12] the phrase recited silently by an individual before reciting the Shma.
Popular among some theosophists and adherents of esoteric Christianity is the conjecture that amen is a derivative of the name of the Egyptian god Amun (which is sometimes also spelled Amen).[13][14][15] Some adherents of Eastern religions believe that amen shares roots with the Sanskrit word, aum.[16] There is no academic support for either of these views.
!