In modern standard English, you as second person pronoun serves a multitude of purposes: singular and plural, subject and object, formal and informal. It wasn’t always so.
Centuries ago the language had singular thou and thee, plural ye and you. The numerical distinction then changed to one of register: thou and thee for familiar use and for speaking to children or people of lower social standing; ye and you for marking courtesy or respect.
Gradually ye and you shifted to the default position, supplanting thou and thee, which were marginalised to regional, religious, and archaic use. Then ye began to wane, for a variety of reasons, until you had taken centre stage as the pronoun of choice in singular and plural uses in all registers – but not all dialects.
Hiberno-English is one dialect where ye is found: I grew up using it in the west of Ireland, and I find it extremely useful. Ye behaves much like you: we have yeer ‘your’, yeers ‘yours’, ye’ll ‘you’ll’, ye’d ‘you’d’, ye’ve ‘you’ve’, ye’re ‘you’re’, and yeerselves ‘yourselves’ (all plural).
These are far more often spoken than written, so they’re less codified than the standard paradigm for you. But I would still consider ye’re ‘your’ in this Irish Examiner article an error (yere without the apostrophe is less wayward):