Old French bordon

← Proto-Germanic *buzdô (derived)

← Proto-Germanic *būs- (mention)

← Proto-West Germanic *burdo (mention)

← Proto-Indo-European *bʰūs- (derived)

← Latin burdonis (mention)

→ English burden (derived)

→ French bourdon (inherited)

→ Galician bordón (borrowed)

→ Norman bourdon (derived)