Kobayashisan
Kobayashisan is a common Japanese surname. It translates to "Little Kobayashi" or "Young Kobayashi". The name Kobayashi itself is a well-established Japanese surname, often meaning "small forest". Therefore, Kobayashisan, when used as a name, would refer to an individual named Kobayashi. It is a frequently encountered surname throughout Japan.
The usage of "san" after a surname is a common honorific in Japanese, signifying politeness and respect.