There is 富士山（ふじやま） in Akita prefecture. https://ja.wikipedia.org/wiki/%E5%AF%8C%E5%A3%AB%E5%B1%B1_(%E7%A7%8B%E7%94%B0%E7%9C%8C)

l think only foreigners call the mountain 'fuji-yama.' Most Japanese always call it 'fuji-san.'

Oh dear, there is really another mountain named fujiyama. I didn't know it. But it's only 35 metres high!

I sometimes heard that people from other countries called the mountain 'fujiyama' as one of Japanese cultural icons such as geisha, sukiyaki etc, but I don't know if that's true. I feel it's kind of stereotyped tourists. Anyway, otherwise, I've never heard it called 'fujiyama'.