'ain't' originates from English, specifically as a contraction of 'am not', 'is not', 'are not', 'has not', or 'have not'.

'ain't' evolved from the contraction of 'am not' and similar phrases in informal English usage.

Initially, it was used as a contraction for 'am not', but over time it evolved to include 'is not', 'are not', 'has not', and 'have not'.