Names ending in a

If Allegra doesn't pack enough punch for you, Allegrezza surely will.

A minor figure in Greek mythology, who was apparently quite fond of incest; she married her uncle and bore several children by Poseidon, god of the sea, who was her grandfather.

Olima began as a surname, first seen in the US as the last name of immigrants from European countries including Italy and Portugal. While it hasn't seen much use as a given name, the feminine ending makes it a definite possibility, especially for speakers of the Romance languages.

A gorgeous Hebrew name that was originally used for boys, but is now increasingly used for girls as well. As a bonus, you get the sweet built-in nickname Nina.