I love
Allegra!
I have character siblings named
Allegra,
Eliza,
Lola, &
Cy.
I had no idea people out there were naming their children
Allegra. It's not even in the top 1000 (and it never has been).
I don't think it will become popular anytime soon. I may be very wrong, but I think most people are still too immature and think
Allegra is a medicine. I don't think that opinion is going to suddenly change.
I'd say it's still safe to use. =D