AY-da may well have been a set of syllables used as a name in Ancient Greece, but that doesn't mean that when parents in late Victorian English-speaking countries developed a passion for a name using those same syllables it necessarily came from the same source. A common Germanic-origin name is a far more likely origin for an English name than is an obscure Ancient Greek name.
♦ Chrisell ♦
All we have to decide is what to do with the time that is given us. - J.R.R. Tolkien.