In the picture below:
1) are there two Mercedeses?
2) are there two Mercedes?
Can we infer from this nGram that the plural noun "Mercedeses" is a disused word, hence the sentence 2) is considered correct?
The general convention is for a proper noun (Mercedes, in this case) ends with an "s", we don't add anything to form the plural. So the correct answer is "Are there two Mercedes?"
What's going on is that words that end in unstressed
Both inflections add
You might think trapeze is an exception, but it’s stressed. This law of suppression of inflectional
For some speakers a terminal
However, for all standard speaker it will suppress an additional