Compound of 消し (keshi, “erasing”, 連(れん)用(よう)形(けい) (ren'yōkei, “stem or continuative form”) of the verb 消(け)す (kesu, “put out, extinguish; erase”)) + ゴム (gomu, “rubber”, from Dutch gom).[1][2]
消(け)しゴム • (keshigomu)