You are one of the only people I have seen mention the name Zinnia! One of the few others is my sister who has said for years that is what she is naming her daughter. She loves it because of her favorite childhood book "Chasing Redbird" ... have you read it?
I love Zinna (and a lot of other flower names), and I'm still working on my husband. I hadn't read that book, though. I have a small herd of dairy goats, and they almost always have flower or plant names, but some I saved for humans!