How about something like Abhentyra? Looks pretty Roegadyn. You could say it was originally an Elezen word that the Roegadyn borrowed at one point, since the Elezen language was inspired by French.

Say one particular Roegadyn sailor traveled to Eorzea many centuries ago and learned to speak with the Elezen he met there. He liked the sound of that word, though he couldn't pronounce it the way they did. He wrote it down in his journal, which was lost after his death, but it has been rediscovered recently and the word along with it.

Or something.