Only the current version so far — new entries appear as the app ships updates.
語源検索 is an education app by Smartphone Kids with 1,000+ downloads (about 1.9K estimated). +3 installs in the last 7 days. Released Dec 14, 2017. Install growth, rank history, SDKs and ad networks.
From the store listing: “It is an application to search the etymology of English words on Google.”