The Watanabe clan members in later days, who claimed to be the descendants of WATANABE no Tsuna, are reportedly descended from his great grandchildren (源次正, 小源次正, 源公頼).
のちの徳川譜代渡辺氏は、渡辺綱の後裔を称し、綱のひ孫の源正（源次正、小源次正、源公頼）の流れを汲むという。