What do Japanese people call each other?

In general, call acquaintances and friends by their first names, just like in China.

Jun is a respectful title for young men, and boys that girls like will also add Jun after their names.

Juniors cannot call their elders by their first names, but vice versa. Generally speaking, when using honorifics, they must address their elders by their surnames. For example, Conan's real name is Kudo Shinichi. Xiaolan calls him Shinichi to show his intimacy, while others basically call him Kudo. A typical example is Hattori Heiji, who calls him Kudo every time he sees Conan.

Extended information

Japanese people not only have a large number of surnames, but their pronunciation and writing of Chinese characters are also quite complicated. For surnames with the same pronunciation, there are several or even ten Chinese characters. There are several ways of writing, and the same Chinese character will also have several pronunciations.

Japanese people are also accustomed to calling people by their surname instead of their given name. If someone goes to find someone named "Sato", there will probably be several "Sato" who will agree together. There is a joke that if you throw a grenade into a crowded crowd during rush hour in Japan, 9 out of 10 people in the crowd will be killed with the surname Sato.

Baidu Encyclopedia: Japanese names