The unique origins of the barangay's namesake came from an interesting story that has been passed down from generations of residents in Brgy. Lingunan. The tale begins with Lingap, the beautiful daughter of a rich tribal family. When the Spaniards came, the natives fled from the area. At this time, Lingap's father called out to her to bring along the pillow which hid the family's jewels. He called out, "Lingap, ang unan!" The Spaniards misheard his remark and thus called their newly conquered area as "Lingunan."

Besides a rich history of the barangay's namesake, another interesting trivia is that Lingunan residents only celebrate their fiesta of the Holy Trinity with food and embellishments every other year. Landmarks in the barangay include the Chateau Valenzuela condominium, Lingunan Elementary School and the Holy Trinity Chapel.