[Coda]

That's a little surprising given that "Charity" is a not-uncommon girls' name. But hitting up a dictionary, "Faile" or "Failie" would be the best feminine name I can find; it means "generosity".

EDIT: On the other hand, "Grace" is easily found as "Eruanna." If it matters to you, "eru" is similar to Hebrew "el" (both meaning "God"). I'm not 100% sure of a euphonic way to combine the two names, though... "Faileanna" perhaps would capture the full meaning of your name?

EDIT 2: Cross-checked another dictionary. "Eruanna" breaks down to "gift of God" so "Faileanna" would mean "gift of generosity" or possibly "generous gift" which is a pretty name in its own right but it rather significantly changes the meaning. "Manáfaile" or "Failalissë" are other options, meaning "generous grace (in the sense of a blessing)" and "sweetness (in the way that grace is sweet) of generosity" although I'm not 100% sure the latter is correctly inflected for a feminine name.