Did the Japanese people commit suicide after World War II?

This question is a bit broad. Obviously, every Japanese person did not commit suicide, but some did, so the answer is...some of them?

In general suicide among Imperial Japanese forces are somewhat exaggerated by western media since it's very foreign to us. There's a previous post that sums things up very well. Basically, only about 600 officers commited seppuku during the war. I kind of suspect that if you include suicidal tactics like Banzai charges and kamikaze planes there would be higher numbers, though.

I haven't been able to find concrete numbers for civilian suicides. They were definitely a thing, although it's difficult to speculate on their reasons. Some may have been motivated by "honorable death" vs "humiliating surrender" like you say, but many more were likely inspired by propaganda insinuating US forces would rape, torture and kill them. Others were ordered or forced to commit suicide. Hirohito sent out a message during the Battle of Saipan saying that civilians should commit suicide rather than surrender, leading to an estimated 1000 civilians committing suicide there. There were also many civilians who committed suicide at Okinawa, either willingly or by force by the order of the Japanese army.