Save Type Surname (from location) Usage Medieval French, History (Ecclesiastical, Rare) Pronounced Pron. /de.ˈlə.ˈsæl/(Old French) [key·simplify] Other Forms FormsLa Salle, Lassalle Meaning & History Means "of the room" in French. It is borne by a saint who is the founder of the Institute of the Brothers of the Christian Schools.