Why did Hermione dare not say Luna's name?

1, because luna believes that there are bubble snot monsters and corner snores in the world, and Hermione doesn't like such ambiguous things as divination. Relatively speaking, she doesn't like luna that much.

2. The names of these two characters come from the magical novel HarryPotter, which is a series of magical literary novels written by British writer J.K. Rowling from/kloc-0 from 1997 to 2007, with a total of seven novels. Among them, the first six books take Hogwarts School of Witchcraft and Wizardry as the main stage, describing the story of the protagonist, a young wizard student, Harry Potter's study, life and adventure in Hogwarts for six years, and the seventh book describes the story of Harry Potter's search for horcruxes and the elimination of Voldemort in the Second Wizarding World War.