Why do most Japanese ships have the word "maru" in their names?

This question has always puzzled me. Later, a classmate also asked me this question. I said I wouldn't tell her. Actually, I don't know. First of all, look at the answers searched online. In fact, the two cannot be simply equated. Maru embodies the unique Japanese customs and culture. In fact, there are also ships in Japan with no maru at the end of the name. For example, the luxury passenger ship "Bird", the ancient warships "Yamato" and "Musashi", and now the ships belonging to the Defense Agency and the Antarctic scientific research ship generally do not have maru after their names. According to Japanese shipping law, ships must be named. The name of the ship must be clearly marked on both sides of the bow and outside the stern. As for "pill", the shipping law stipulates in the formalities: "The word" pill "should be appended to the end of the ship name as far as possible." From this "try your best", we can see that the law does not force the shipowner to add the word "pill" to the name of the ship, but only a suggestion. Let's talk about the origin of adding "pills" to the stern of Japanese ships. There are many theories about its origin in Japan. Toyotomi Hideyoshi said. It is said that he once named the ship "Japan Maru". Since then, people have imitated Japanese maru and added the word "maru" to other ship names. Secondly, China Huangdi said that Huangdi was the legendary emperor in ancient China. It is said that during his reign, a man named Zitong Pill fell from the sky and was called a mortal shipbuilding. In memory of him, people named the ship after his name Maru. The theory of house numbers (the theory of store names). People in feudal times often used "Maru" to name the store. Later, it was used to name ships. Fourthly, it is said that the pronunciation of マロ"(maro "is as follows: 1. It is mainly used in peacetime. Therefore, it is classified as "Ma Lu". At first, "マロ" was used in other people's names to show respect. Later, it gradually expanded to add "*" after the favorite things, such as after the name of a dog or a knife. The Chinese character "マロ" has also been changed from "to".