Isn't it written イム in Katakana? So Imu, right?
On that note, googling that lead me to this Wikipedia article
Apparently Imu is also the name of a mental disorder only seen among Ainu people (orignal native people of Japan, mainly found in the North of the country, i.e. Hokkaido)
https://ja-m-wikipedia-org.translate.goog/wiki/イム?_x_tr_sl=ja&_x_tr_tl=en&_x_tr_hl=de&_x_tr_pto=wapp
Dunno if Oda plans to reference that in any way, but still kinda interesting
 
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