Its title refers to the fact that the setsuwa tales it contains were gleaned from those not included in the "Ujidainagon monogatari" ("The Tale of Chief Counselor Uji," a collection of setsuwa thought to have been compiled by the Ujidainagon MINAMOTO no Takakuni which is no longer extant).
題名は、佚書『宇治大納言物語』（宇治大納言源隆国が編纂したとされる説話集、現存しない）から漏れた話題を拾い集めたもの、という意味である。