People living today with the family name Minamoto are not necessarily related to the historical Minamoto clan, but for the descendants of MINAMOTO no Yoshikiyo, the name is still used as a relevant surname; there are also descriptions in historical materials from the Edo period about how Minamoto was used as a Myoji or Sei (family name).
現代の源姓の人物は歴史上の源氏と必ずしも関係があるわけではないが、源義清の子孫は現在も源を今日的な意味の姓として名乗っており、江戸時代の資料等にも苗字が源であり、姓も源とある。