Sapphire is an elegant and precious name of Greek and Hebrew origin, meaning blue gemstone. This jewel name directly represents a clear, brilliant blue, akin to a perfect blue day. It is a moderately popular name, especially in English-speaking countries like the United States and the United Kingdom, often associated with the birthstone for September. The author Ramona Lofton is famously known by her pen name, Sapphire.
Prompt: Generate 12 names for girls that mean blue day.