Major place names in Japan are romanized with the Japanese readings, but minor places use Mandarin readings. For example, a nursery school in Yokohama called 野毛山幼稚園, which is read Nogeyama Yōchien, has the label yě máo shān yò zhì yuán [1].
You can find the "correct" OSM entity here: https://osmapp.org/way/94708772