"Blend of San Juan and -ita"
The name Sanjuanita is commonly a female name from the "Spanish" origin.
Sanjuanita is a Spanish feminine name formed from San Juan, the Spanish form of Saint John, plus the diminutive suffix -ita. The two elements are written together as one word, which distinguishes it from the separate San Juan and from the shorter Juanita.
The pronunciation of Sanjuanita is san-wah-NEE-tuh.