スイ, ほ, お, こう, のり, ほい
ear, ear (grain), head, crest (wave)
JLPT1 G7 S15 F1656
惠# benefaction + 禾 grain/rice → heavy *ears/heads* of grain (a benefaction of the heavens). *Crest* (of a wave) and *point* (of a spear/writing brush) are via association with the tips of the ears of grain plants.
[Full Kanji Etymology List]