They're middle names and they won't be used often at all--no one has the right to tell you that you can't do what you please with them. What really counts is
1. How
Leah Alexandra and
Jonas Alejandro sound as individual combinations
and
2. How
Leah and
Jonas sound together
And as far as I'm concerned, the answer to both of those is that they're fine.
Array
"What are these parents thinking?...Let's name her Madison--she'll live in her own world: 16 square miles surrounded by reality." -- Susan Lampert Smith