The English personal and interrogative pronouns have the following subject and object forms: Historically, Middle English and Early Modern English retained the T–V distinction; the second person pronoun had separate singular/familiar and plural/formal forms with subject and object forms of both.
Other languages divide object pronouns into a larger variety of classes.
English, for example, once had an extensive declension system that specified distinct accusative and dative case forms for both nouns and pronouns.
With the exception of the genitive (the "apostrophe-s" form), in nouns this system disappeared entirely, while in personal pronouns it collapsed into a single case, covering the roles of both accusative and dative, as well as all instances after a preposition.
For a discussion of the use of historically object pronouns in subject position in English (e.g. "Jay and me will arrive later"), see the article on English personal pronouns.