出典:Wiktionary
From tūn, from Proto-West Germanic *tūn, from Proto-Germanic *tūną, from Gaulish dunon, from Proto-Celtic *dūnom, from Proto-Indo-European *dʰewh₂- (“to finish, come full circle”).
Owing to Old English grammar, often found in the form of -ingtūn (-ington) appended to various roots.