What does Mariana mean?
The Spanish form of the Latin Mariana, feminine of Marianus, a name derived from the Roman family name Marius (itself of uncertain meaning). From early times it was reinterpreted as a derivative of María, blending the two associations.
What does Carmen mean?
A Marian devotional name from the title 'María del Carmen', Our Lady of Mount Carmel. Carmel comes from the Hebrew karmel 'garden, orchard, vineyard'. By coincidence the identical Latin word carmen means 'song, poem', which has reinforced the name's appeal.