Perhaps a variation of Cassia or a modern invention.
The exact etymology of Casara is uncertain. It is often considered a modern rhythmic variation of names like Cassia, meaning cinnamon, or Sara, meaning princess. In some contexts, it is used as a creative blend of Latin-based sounds.
Less common today
Casara isn't in the latest US Top 1000. It last peaked at #6,230 in 1991.
US births per 5-year period, 1990βpresent (SSA data).