The district takes its name of the Tirrá tree (Ulmus mexicana).
Ulmus mexicana, the Mexican elm, a large deciduous tree species endemic to Mexico and Central America
In Costa Rica the Mexican Elm is known as Tirrá; the neighbourhood (district) of Tirrases in Curridabat, San José, takes its name from the tree.
Ulmus americana | Salón de la Plástica Mexicana | Ulmus parvifolia | Ulmus minor | Ulmus mexicana | ''Ulmus davidiana'' var. ''japonica'' | Ulmus 'Sapporo Autumn Gold' | Ulmus procera | Ulmus microcarpa | Ulmus × hollandica | Ulmus 'Hoersholmiensis' | Ulmus 'Commelin' | Ulmus americana 'Patmore' | Sambucus mexicana | Salvia mexicana | Sabal mexicana | Purshia mexicana | Prunus mexicana | Organizacion Editorial Mexicana | Mexicana Flight 704 | Lucilia mexicana | Dioscorea mexicana | Crataegus mexicana | Arte de la lengua mexicana con la declaración de los adverbios della | Argemone mexicana |