so..... I was thinking of something like Jade, you know, the ornamental stone that's same the color as mint?
( lame ? meh... :

) - so why not one of its variants:
Jada,
Jayda,
Jaida...
Also, some really smart guy suggested Juno before, which I really like... so again... why not something similar, like
Juna.
Or
Jana, or
Janna which are variants of Johana (which I do not like) and shares its meaning.
uhh... and plz no Juana or Juanita. As a native spanish speaker I can tell you it doesn't sound great at all. Nowadays you won't find so many people named like that. Not young people at least.