巴伦西亚是 西班牙语发音
瓦伦西亚是 英语发音
william 叫 bill的起因是中世纪流行字母交换。像Dick的名字发展成Rick。另外一个就是硬辅音发音容易一些。
而不是他们发音一样
There are many theories on why Bill became a nickname for William; the most obvious is that it was part of the Middle Ages trend of letter swapping. Much how Dick is a rhyming nickname for Rick, the same is true of Bill and Will.