Never stopped anyone before , has it ? <| sep |> That goes against every rule in English . If you have more than one of a proper noun you can add s or es to it to pluralize it . That is just a rule . Also your example falls flat . If someone asks you whats on the floor you can appropriately respond with either hair or hairs . Either is acceptable . Also hair is a horrible example since it is such a unique word . Almost all nouns and proper nouns can not be referred to as plural when using their singular form . Example would be the word can compared to cans . Edit The only reason the plural of Lego is supposed to be Lego is because the lego company suggests that . Since when do corporations dictate grammar ? <| sep |> Did you grow the wheat ?