エキ, イ, やさ.しい, やす.い
easy, ready to, simple, fortune-telling, divination
JLPT3 G5 S8 F571
The relevant bronzeware inscription form combines 彡 pattern + a rudimentary depiction of a lizard → lizard stretched flat on the ground in sunning itself. *Easy* and *peaceful* are extended meanings (← be at ease/peace) with *make light of* and *control/rule* (with ease) by further extension. *Change* and *exchange* are borrowed meanings → *divination* (← change continuously). Distinguish 易 from 昜 (sun rising high in the sky).
[Full Kanji Etymology List]