It has somewhat of an artistic flare about it and is not too "girlie" or "frilly".

Carly was most likely originally a pet form of names like Caroline or Carol. Currently it is more frequently used on its own. In the USA it was brought to public attention by singer/songwriter Carly Simon (born 1945), though it didn't become popular until the 1980s.
See Also: Karley, Karlie, Charles, Caroline

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