A perfectly symmetrical volcanic cone, the mountain is a near-mythical national symbol immortalized in countless works of art, including Hokusai's 36 Views of Mt. Fuji.
The Japanese always refer to Mt. Fuji as Fuji-san, but the -san (山) here simply means "mountain", and has nothing to do with the honorific san (さん) for people's names. "Fujiyama" is a misreading of the name, and is never used by the Japanese themselves — except in the set phrase Fujiyama geisha, a lament at how Japan is misunderstood in the West.