The reason why Nissan uses an English font in its logo is because the company has a global presence and operates in many different countries around the world, including English-speaking markets like the United States, Canada, and the United Kingdom. Using an English font in the logo helps to reinforce the company's international identity and makes it easier for people in different countries to recognize the brand.
It is worth noting that while the logo features the English letters "NISSAN", the company's name is actually pronounced differently in Japanese. In Japanese, the company is known as "Nissan Motor Company, Limited" and is pronounced "Nissan Jidōsha Kabushiki-gaisha" in Japanese.