ヨ, あま.る, あま.り, あま.す, あんま.り, あまる
too much, myself, surplus, other, remainder
JLPT3 G5 S7 F680
The relevant oracle bone form of this character is 土# pile of earth being smoothed (lazily) with a scoop, with a bronzeware inscription form adding 八 split right and left → stretch the arms to both sides to disperse surplus earth in smoothing/leveling a pile → *surplus* (← level surplus earth). In Japan, 余 was also adopted as a Shinjitai (new character form) to replace 餘, according to which 余 also conveys the meanings *remain*; *leave*; *be left over*.
[Full Kanji Etymology List]