Everyone knows the word “alphabet” itself ultimately derives from the first two letters of the Greek alphabet: “alpha” and “beta”. But there are two words in English that most likely have their origin in phonetic runs of letters:

abecedarium [a-b-c-d]: a primer for teaching the alphabet itself.

element [l-m-n]: from Latin elementum, perhaps ultimately from lmn, first three letters of the second half of the Canaanite alphabet, recited by ancient scribes when learning it.