Proto-Germanic *bulstraz

→ English bolster (inherited)

→ Old English bolster (inherited)

→ German Polster (inherited)

→ Middle English bolster (inherited)

→ Old Swedish bulster (inherited)

→ Icelandic bólstur (derived)

→ Dutch bolster (inherited)

→ Old Norse bólstr (inherited)

→ Saterland Frisian Bulster (inherited)

→ Swedish bolster (inherited)