Why do people who bury coffins in rural areas have different surnames?

There seems to be no such statement. People who carry coffins don't have to have the same surname. I don't know where you heard it. It may be unique to you, but I haven't heard of it anywhere else.

Compared with cities, rural areas are relatively backward, not only in some facilities and buildings, but also in ideology. Many old people in rural areas have not changed. Because of the ideological emancipation in the new era, the old people are old and their ability to accept new things is limited, so they pay special attention to what has been handed down from the older generation, because in their view, this is the only thing they can give to the young people, that is, some customs and taboos.

Carrying coffins in rural areas can be said to be a major event, not just carrying coffins. After someone dies, burial requires a lot of preparation. For example, put a wreath around the coffin at home or somewhere, put other similar things on it, and then invite some people, including monks and some old people in the village who can recite scriptures, to come back and bid farewell to the last journey. Then, on the day of the funeral, every household in the village seemed to be closed, and then funeral music was played and gradually went to the cemetery.

There are more things to pay attention to in the process of carrying coffins, and the most important thing is not to stop and rest. Once you stop, it means going to the grave of this place. Therefore, this is very strict. Those who choose to carry coffins must choose strong middle-aged people and be married. Then the structure under the coffin must be firm to prevent the rope from falling off halfway. In the traditional concept, it is absolutely not allowed to rest on the road, which will affect the rest of the deceased.

There are also some precautions in selecting coffin bearers. For example, men whose wives are pregnant should try not to carry coffins, and unmarried men should not carry coffins. The former is the possible influence of superstition on children, and the latter is due to the conflict between yin and yang.