Where does “withero” come from?

withero (Old Dutch) comes from Proto-West Germanic weþru, from Proto-Germanic weþruz, from Proto-Indo-European wēt- — year.

Ancestry of “withero”, step by step

StepLanguageWordMeaning
1Proto-West Germanicweþruyearling lamb; wether, ram
2Proto-Germanicweþruzyearling lamb; wether, ram
3Proto-Indo-Europeanwēt-year
Every word from Proto-Indo-European wēt- →Every word from Proto-Germanic weþruz →Every word from Proto-West Germanic weþru →
withero — Etymology, Origin & Word History | Etymology Explorer