Santa Bárbara = The Queen of the Missions [San Luis Rey and Santa Barbara had to be given royal nicknames for their beauty. Since Rey means King, that left Queen for Santa Barbara; a female name.]
San Buenaventura = The Mission by the Sea [Speaks for itself; the Mission is close to the ocean.]
San Fernando Rey de España = The Mission of the Valley [The "Valley" is the nickname for the entire area surrounding the Mission.]
San Gabriel Arcángel = The Pride of the Missions [An important Mission in history and central to the entire development of Los Angeles.]
San Juan Capistrano = Jewel of the Missions or Mission of the Swallow [Originally, a crown jewel in the chain of Missions and who can not know about the "Swallows of Capistrano"?]