In the first- and third-person, standard English speakers use distinct pronouns to denote singular and plural.
Crozier (1984) suggests that during the 19th century, when many Irish-speakers switched to speaking English, they filled that gap with you ones, primarily because Irish has both the singular second-person pronoun tú and the plural form sibh.
In other parts of the United States, similarly regional British, Irish and Scots-Irish speakers brought over different dialectal second-person plural forms.
Examples include yunz, which is used in and around Middletown, Pennsylvania; youse, which is found mainly in New York City and Chicago, the Philadelphia dialect and New Jersey; and y'all, which is ubiquitous in the South.
In the TV series One Dollar (2018), set in a rust belt town (shot in and around Pittsburgh), the Yinz address is frequently used.