The surname Underdown was first found in Kent, where the name the first record of the name of a Wulfwinus Vunderdune in 1185. Another record shows that Theobald de Vunderdoune listed in the Feet of Fines of Kent in 1316.  The surname roughly translates to "the dweller at the foot of the hill."
This web page shows only a small excerpt of our Underdown research. Another 78 words (6 lines of text) covering the years 1327, 1566, 1587 and 1566 are included under the topic Early Underdown History in all our PDF Extended History products and printed products wherever possible.
Emigration to New Zealand followed in the footsteps of the European explorers, such as Captain Cook (1769-70): first came sealers, whalers, missionaries, and traders. By 1838, the British New Zealand Company had begun buying land from the Maori tribes, and selling it to settlers, and, after the Treaty of Waitangi in 1840, many British families set out on the arduous six month journey from Britain to Aotearoa to start a new life. Early immigrants include:
Underdown Settlers in New Zealand in the 19th Century
William Underdown, who landed in Wellington, New Zealand in 1840
William Underdown, aged 20, a farm labourer, who arrived in Port Nicholson aboard the ship "Olympus" in 1841
Mr. William Underdown, (b. 1820), aged 20, British settler travelling from London aboard the ship "Olympus" arriving in Wellington, New Zealand on 20th April 1841 
Miss Hannah Underdown, (b. 1850), aged 20, English general servant, from Sussex travelling from London aboard the ship "Ramsey" arriving in Lyttelton, Christchurch, South Island, New Zealand on 17th June 1870