Since the name is for a girl, I would suggest **婕然** instead of 捷然, unless you have attached a story or meaning to the latter.

- 婕 - handsome. (婕妤 - the official name of the female officer in the Han Dynasty) 

- 然 is a sex-neutral word with many good meanings such as certainly, pledge, promise, understand, agree, fit, ... (the most associated words - 自然, 天然...)

Another suggestion will be "**潔然**", 取義於"簡**潔**自**然**".