The western neighbours of the Sumo Indians were and are (though few still survive) the Lenca Indians, who formerly occupied large parts of Honduras.
Several tribes, such as the Paya (or Poya) and the Jicaques, form together with the Lenca, Sumo (Matagalpa, Tauakhca and Ulua) and Misquito one great family.
There are scientific reasons to believe that the Xinca also belong to the same great family as the Lenca, Jicaques, Paya, Misquito-Sumo.
It seems that there was formerly a mutual interpenetration between Lenca, Sumo and Chorotega tribes.
The Misquito country is characterized by names terminating in laya, water, or auala, river; the Sumo and Ulua country by names in uas, water; the Matagalpan by names in li, water; the Lenca by names in tique, lique, isque and (ai) quin.
Such Lenca names occur on the northeastern boundary of the Ultra-Lempa country of Salvador.
Probably the Mexican elements superseded the Maya so completely that there remained no trace of the Maya except archaeological objects; it is to be supposed that the Lenca and Sumo tribes superseded the Chorotega in Salvador.