Why is the same thing called sundae in KFC and Xindi in McDonald's?

The same thing, KFC is called sundae, and McDonald's is called Xindi:

As early as 1897, Americans had eaten "sundae" ice cream. It is said that the "sundae" ice cream was invented by an ice cream shop owner named George in Wisconsin. George did something unusual. He poured cherry syrup on the ice cream, and then put a sugar-pickled cherry on it and sold it to customers. At first, this mixed ice cream was only sold on Sundays. Later, people thought it was very delicious and the demand was increasing, so George supplied it to people every day. Since this kind of ice cream was originally sold on Sunday, the shopkeeper named it Sunday. ?

But Sunday is the Sabbath of Jesus, and the church thinks it is blasphemy to use this day as a trademark name. Therefore, Sunday had to be renamed sundae, which has been used ever since. In order to avoid taboos, Sunday ice cream also uses some other names, such as Sun Di and Sandy. ?

In the same way, KFC is called Sunda and McDonald's is called Xindi because of different transliteration. The two companies want to distinguish each other's products to show the difference.

Why are the ice creams of KFC and McDonald's called "sundaes"?

As early as 1897, Americans had eaten "sundae" ice cream. It is said that the "sundae" ice cream was invented by an ice cream shop owner named George in Wisconsin. George did something unusual. He poured cherry syrup on the ice cream, and then put a sugar-pickled cherry on it and sold it to customers. At first, this mixed ice cream was only sold on Sundays. Later, people thought it was very delicious and the demand was increasing, so George supplied it to people every day. Since this kind of ice cream was originally sold on Sunday, the shopkeeper named it Sunday. ?

But Sunday is the Sabbath of Jesus, and the church thinks it is blasphemy to use this day as a trademark name. Therefore, Sunday had to be renamed sundae, which has been used ever since. In order to avoid taboos, Sunday ice cream also uses some other names, such as Sun Di and Sandy.