Middle High German swern

← Proto-Germanic *swarjaną (inherited)

← Proto-Germanic *sweraną (inherited)

← Proto-West Germanic *swarjan (inherited)

← Old High German swerien (inherited)

← Old High German sweren (mention)

← Old High German sweran (inherited)

→ German schwören (inherited)

→ German schwären (mention)

→ Middle English sweren (cognate)

→ Alemannic German schwere (inherited)