nouns - Are there any words in English that have a plural with a separate derivation?

There are some irregular plurals in English (child/children, goose/geese), but all of the ones I know of share the same root word.

In some languages, there are some irregular pairs where the singular form does not have the same root as the plural form, such as in Russian (год/лет, человек/люди).

Are there any such irregular plurals in English?