The surname Downtun was first found in Wiltshire at Downton, a village and civil parish on the River Avon that dates back to Roman times where in 1953 the site of a Roman villa was discovered there. Moving ahead in time, the Saxons held the area c. 672 when it was listed as Duntun. 
More than 400 years later, the Domesday Book of 1086 lists the place name as Duntone.  The Manor House in Downton is generally thought to be the longest inhabited house in the South of England as it has been in use since c. 850.
There are two other locals named Downton: a civil parish in Herefordshire that contains the village of Downton-on-the-Rock; and a hamlet in Hampshire. Downton literally means "hill settlement" or "farmstead on or by the hill or down." 
This web page shows only a small excerpt of our Downtun research. Another 60 words (4 lines of text) covering the years 161 and 1615 are included under the topic Early Downtun History in all our PDF Extended History products and printed products wherever possible.
More information is included under the topic Early Downtun Notables in all our PDF Extended History products and printed products wherever possible.
Migration of the Downtun family
Some of the first settlers of this family name or some of its variants were: John Downton who settled in Virginia in 1655; Samuel Downton settled in Barbados in 1654; Richard Downton settled in Nevis in 1663; along with his brother William.