Grace is drawn directly from the English word, itself rooted in Latin gratia, and is commonly linked with both physical elegance and a sense of favor freely given rather than earned. The name is often read as suggesting ease under pressure -- composure that looks effortless, even when it isn't.
The work done to obtain perfumes and to recite invocations is better than the work done with precipitable gases and other spirits. - Picatrix (Andalusia, ~1000.AD)