When Nasu no Munehisa returned to his homeland, the remnants of the Taira family changed their surname from Taira to Nasu out of gratitude for Munehisa, who saved their lives by stopping his hunt.
やがて、那須宗久は本領へと引き上げたが、このとき、平家の残党は自分たちへの追討をとりやめ命を救ってくれた宗久への感謝の気持ちから那須姓に改めたという。