English Bern

← Gaulish Brennus (mention)

← Proto-Celtic *berna (derived)

← Proto-Celtic *branos (mention)

← German Bär (mention)

← German Berlin (mention)

← Alemannic German Bärn (borrowed)

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

← Undetermined (mention)

→ English Bernese (suffix)

→ German Sieg (link)