It is believed that he was from Tada clan, which was the direct descendant of the Settsu-Genji (Minamoto clan), and was the eighth generation of the decendent of MINAMOTO no Mitsunaka (TADA no Manju) and the son of MINAMOTO no Takayori (the name of Tsunezane is not confirmed in the family trees including "Sonpi Bunmyaku" [a text compiled in the fourteenth century that records the lineages of the aristocracy]).
摂津源氏の嫡流であった多田氏の一族で、源満仲（多田満仲）の8代孫にあたる源高頼の子とされる（『尊卑分脈』等の系図では経実の名は確認出来ない）。