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English word y'know comes from English know, English y' ((informal, dialect, subject pronoun) you; ye.)
know (English)
(rare) Knowledge; the state of knowing. (intransitive) To be or become aware or cognizant.. (intransitive) To have knowledge; to have information, be informed.. (intransitive, obsolete) To be acquainted (with another person).. (transitive) To be able to play or perform (a song or other piece of music).. (transitive) To be acquainted or familiar with; to have encountered.. (transitive) To be [...]
y' (English)
(informal, dialect, subject pronoun) you; ye.
yaknow (English)