In addition to being called Mount Iwaki, the mountain is also widely nicknamed , and less frequently , due its conical shape that bears similarity to Mount Fuji. It was also dubbed Peak Tilesius in 1805 by Adam Johann von Krusenstern during the first Russian circumnavigation of the Earth after German naturalist, Wilhelm Gottlieb Tilesius von Tilenau, though the name had dropped out of use among Westerners by 1858 in favor of its native name.