Where does “reckoneth” come from?

reckoneth (English) comes from English reckon, from Middle English rekenen, from Old English recenian, from Proto-Germanic rekanōną, from Proto-Indo-European h₃reǵ- — to straighten, to right oneself; right; just.

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

Definitions

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

Ancestry of “reckoneth”, step by step

reckoneth traces back through two separate lines of ancestry.

via English reckon

StepLanguageWordMeaning
1EnglishreckonTo count; to enumerate; to number; also, to...
2Middle Englishrekenen
3Old Englishrecenianto arrange, dispose, reckon
4Proto-Germanicrekanōnąto count; to explain
5Proto-Indo-Europeanh₃reǵ-to straighten, to right oneself; right; just

via English eth

StepLanguageWordMeaning
1EnglishethA letter introduced into Old English to...
Every word from Proto-Indo-European h₃reǵ-Every word from Proto-Germanic rekanōnąEvery word from Old English recenian