70%RatingSave Gender Masculine Usage Spanish (Rare) Pronounced Pron. /teɾ.ˈθe.ɾo/(European Spanish) /teɾ.ˈse.ɾo/(Latin American Spanish) [key·simplify] Meaning & History Means "third" in Spanish. This name was traditionally given to the third child born. Categories birth order, numeric meanings, rare Spanish, Spanish words, word names