Here's why:

* Harsh environment: The Moon lacks a breathable atmosphere, has extreme temperature swings, and is bombarded by radiation. These conditions are extremely hostile to life as we know it, including bacteria.

* No confirmed life: All missions to the Moon have not found any evidence of life, including microbial life.

* Contamination concerns: While it's possible that some microbes from Earth might have been accidentally transported to the Moon by spacecraft, there is no evidence to suggest that they have survived or multiplied.

So, to answer your question directly, there's no specific name for "bacteria on the Moon" because there is no evidence of such bacteria existing.