The name Exa is a girl's name meaning "adorned". Exa and discussed in our forums with posts like "Generation CAF #38 (with occupations)".
From the experts:
Does Exa make Achsah more approachable or just nudge it into sci-fi territory? We can imagine a parent in search of the truly unique girls' name finding it appealing as a middle. Exie is the short form.