Tijuana
Name

The city's name comes from the rancho that Santiago Argüello Moraga established in 1829 on his Mexican land grant, naming it Rancho Tía Juana.

The first Spanish mission referred to the settlement variously as Rancho Tía Juana, Tihuan and finally, Tijuana. While the city was founded as “Tijuana” in 1889, "Tia Juana" remained the English-language name for the river, as well as a U.S. settlement that is now part of San Ysidro, until approximately 1916.

The commonly accepted theory among historians is that Tía Juana, as Argüello named his rancho, is derived from the word Tiwan ("by the sea") in the language of the Kumeyaay —the First Nations people of the San Diego-Tijuana region. Urban legend, on the other hand, states that Tía Juana, which means "Aunt Jane" in Spanish, was a real person whose inn provided food and lodging to travelers. There is, however, no record of such an inn; in fact, the first building in the area was built by Argüello in any case, after naming his ranch Rancho Tía Juana.

In California, Tijuana is often referred to as T.J.
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