Where does “fiortho” come from?

fiortho (Old Dutch) comes from Proto-West Germanic feurþō, from Proto-Germanic fedurþô — fourth.

Ancestry of “fiortho”, step by step

StepLanguageWordMeaning
1Proto-West Germanicfeurþōfourth
2Proto-Germanicfedurþôfourth

Words derived from “fiortho”

Every word from Proto-Germanic fedurþô →Every word from Proto-West Germanic feurþō →