In addition to longan, what does the word "longan" also mean? That is, what does the word "longan" mean? What does it mean in detail?

It is said that a long time ago, in the Fujian area, there was an evil dragon. Every August sea tide, it would cause trouble, destroy crops, ruin houses, and kill countless people and animals. The surrounding people had no choice but to flee their homes and hide in caves. There was a local young man named Guiyuan who was very skilled in martial arts. He saw the evil dragon causing trouble and determined to eliminate harm for the people and fight with the evil dragon. In August, when the tide came, he prepared wine, pork and mutton, and put them together. After the evil dragon came ashore, his saliva drooled when he saw the pork and mutton, and he ate all the pork and mutton in a few mouthfuls. Because the pork and mutton had been soaked in a lot of wine, the evil dragon lay on the ground motionless before it could go far. At this time, Guiyuan raised the steel knife and stabbed the dragon's left eye. The dragon's eye was stabbed out. The dragon rolled back and forth in pain. When he was about to escape, Guiyuan grabbed the dragon's horn and rode on the dragon. When the dragon tried his best to When getting rid of Guiyuan, Guiyuan stabbed the evil dragon in the right eye with a steel knife. The evil dragon lost both eyes and screamed in pain. After a struggle, the dragon bled to death. Guiyuan also died due to being seriously injured in the fight. So, a kind of fruit grew in this place, which people called "longan" and "longan". Another saying is that ancient people compared the round spherical fruits of longan to various eyes. The big longan is called longan, the medium-sized longan is called tiger eye, and the smallest one is called ghost eye. However, modern people all unified them. It’s called longan or longan.