Looking at the definitions given for yeah, yeh, yep, or yup, all those words are defined as exclamation & noun nonstandard spelling of yes, representing informal pronunciation. Looking at the examples provided from the Werriam-Webster Online, it seems that yeah, and yep are used in two different cases.
synonyms - When is it appropriate to use "Yeah" and "Yep" as variants ...
Yes is the same word as yea which is the same in germanic. It's a very old word. Being one of the most used words in the English language, yea probably was said as yep and yup in many colloquial settings, workshops, pubs many times before it was recorded in writing. yup is a fairly low energy way of say the word, which is probably easier to pronounce than yea, so laborers saying yea would have ...
Where did the slang word "yeppers" come from? I have googled it and found dates as far back as the 30s and geographic areas including Florida, the midwest and Pennsylvania.
Where did "yeppers" come from? - English Language & Usage Stack Exchange
SAIC-GM-Wuling (SGMW) has just launched the new 2026 Baojun Yep Second Anniversary Edition in China, almost two and a half years after the initial launch of the fully electric mini crossover. General ...