I seriously wouldn't worry about the fact that your name doesn't fit conventions. That's all they are - conventions. Nine times out of ten, yes, an Elezen girl would not be named Estera. Nine out of ten Elezen girls also won't grow up to swing swords and kill marmots. You don't have to be a slave to conventions if your character's name doesn't quite fit into them.
If it helps, think of the conventions as the traditional naming pattern if all else is equal. Using my own character as an example, Rhio Aldul would not have received her name if she had grown up in a traditional Miqo'te community. But she didn't; she grew up in the Ul'dahn community with a mother whose first name was an Elezen name that Rhio's grandmother happened to like. Her name bears traces of her ancestry, but her surname and middle name are decidedly against tradition. There are tons of reasons why your characters' parents may have avoided tradition, and nothing saying that you can't deviate.
If it helps, think of the conventions as the traditional naming pattern if all else is equal. Using my own character as an example, Rhio Aldul would not have received her name if she had grown up in a traditional Miqo'te community. But she didn't; she grew up in the Ul'dahn community with a mother whose first name was an Elezen name that Rhio's grandmother happened to like. Her name bears traces of her ancestry, but her surname and middle name are decidedly against tradition. There are tons of reasons why your characters' parents may have avoided tradition, and nothing saying that you can't deviate.
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In-character: Rhio's dossier | Out-of-character: Player profile
In-character: Rhio's dossier | Out-of-character: Player profile
