According to "History of Yonago City," several roots of the Nakamura clan (theories including descendants of the Minamoto clan and the Taira clan) contain many uncertain elements and can't be regarded as historical facts, however, the family tree from Kazuuji, Icchu's father and after is highly reliable.
『米子市史』には、数種類ある中村氏にみられるルーツ(源氏末裔、平氏末裔説等)は不確定的要素が多く、歴史的事実とみなすことはできないが、一忠の父・一氏以降の系譜は信頼性が高いとしている。