Where does “rappeth” come from?

rappeth (English) comes from English rap, from Middle English rap.

rappeth (English): Third-person singular simple present indicative...

Definitions

  1. Third-person singular simple present indicative...

Ancestry of “rappeth”, step by step

rappeth traces back through two separate lines of ancestry.

via English rap

StepLanguageWordMeaning
1EnglishrapA sharp blow with something hard; Blame for...
2Middle Englishrap

via English eth

StepLanguageWordMeaning
1EnglishethA letter introduced into Old English to...
Every word from Middle English rapEvery word from English rap
rappeth — Etymology, Origin & Word History | Etymology Explorer