San Juan.

Headword: 
San Juan.
Principal English Translation: 

a personal name, such as we see held by a don Martín de San Juan in the Mexico City area in 1564; a name such as this would, later in the Spanish colonial period, sometimes be shortened to just Juan, resulting in a name such as Martín Juan; but this phenomenon of two first names was more likely for those who did not have the honorific title don

San Juan was also a popular saint's name that became attached to indigenous communities.