Ey comes from Old English ieg, eg ('island'), from Proto-Germanic *awjo ('thing on water'), from Proto-Indo-European *akwa- ('water'). Survives chiefly in place-names such as Anglesey and Battersea. The development is chiefly inherited within English and its older relatives, with the later form continuing material already present in the language's ancestry. In present use, it is used as a noun meaning "a dialectal or archaic word for an island, especially a small one", so the historical material remains connected with the current sense rather than standing as bare ancestry. The wider English family includes related forms such as island, eyot, and ait, showing how the same historical material continues to organize neighboring vocabulary. The named historical forms include Old English ieg, Proto-Germanic *awjo, and Proto-Indo-European *akwa-, keeping the history tied to concrete forms rather than a loose resemblance. Its semantic neighborhood includes island, isle, islet, and ait, locating the modern specialization without adding a new origin story.