This is just a wild guess, but it might have something to do with فِضَّة (fiḍḍa, "silver") or فَضَاء (faḍāʔ, "empty space"). It would be great to know the "official" spelling of Fadha in Arabic to know what's the closest word in Arabic.
Link to those words:
https://en.wiktionary.org/wiki/%D9%81%D8%B6%D8%A7%D8%A1https://en.wiktionary.org/wiki/%D9%81%D8%B6%D8%A9