I went into a rabbit hole trying to find out the plural of Lexus. According to Toyota it's Lexus[1]. Lexi is another option, but apparently the brand name is not derived from the Latin term, so some lean towards Lexuses[2].
[1]: https://jalopnik.com/breaking-minds-and-spirits-everywhere-l...
Like how tsunami is never tsunamis. Or sushi is never sushis. One might argue that "eating sushi" implies multiples by the nature of sushi. Yet McDonalds sells French Fries not French Fry. Likewise we eat Potato Chips not Potato Chip. Thus in other words beyond Lexus the english language adopts the Japanese style.
For what it's worth, Lexus as the plural form would even be consistent with Latin's fourth declension[0].
[0] https://en.wikipedia.org/wiki/Latin_declension#Fourth_declen...