I assume it’s for a story - so it might be helpful to think about Nova’s family and background and pick a name that reflects that. It helps you write a more well-rounded character.
So what is Nova’s cultural background (for example Irish, Latina, Indonesia, Native American, Southern US). Did her parents hyphenate their last names? Did she have a more ordinary last name so her parents gave her a more unique first name? The last name could reflect that, for example
Characters rarely need a middle name - but if you want one, again think of her background. Was she named after a relative? Mother’s maiden name? Place where her parents met? A virtue the parents valued? A family tradition where are girls have Rose as a middle name or something. For example