白石みずほ is a Japanese name.

Here's a breakdown of the name:

1. 白石 (Shirai Shi) - This is the family name.

- 白 (shiro/shirai) means "white"

- 石 (ishi) means "stone"

2. みずほ (Mizuho) - This is the given name.

In Japanese naming conventions, the family name typically comes first, followed by the given name.

Mizuho is not an uncommon name in Japan. It can mean "water ears" (水穂), which might be referring to rice paddies after a rainstorm, as "mizu" means water and "ho" can mean ear (of grain).

Without more context, it's difficult to provide specific information about this particular person. If you're looking for information about someone with this name, you might want to provide additional details or specify the context in which you encountered this name.