Hello Hugo,
Interesting question !
As a native of Derry/ Londonderry in Ireland and having visited both Derry and Londonderry in the USA - in New Hampshire - I can tell you that there are quite a few other Derrys and Londonderrys. The above US towns - Derry:
http://www.derry.nh.us/ and Lonndondedrry:
http://www.londonderrynh.org/ - I visited are in New Hampshire and are about 3 miles apart from each other. If you have a look at the towns in Wikipedia, it will give you a good ,short history of the places - and confirm that the founders were citizens of Derry / Londonderry.
In addition to this other Londonderry, there are also the following Londonderrys in the USA, according to Multimap:
http://www.multimap.com/
1.Londonderry, Guernsey, Ohio
2.Londonderry, Ross, Ohio
3.Londonderry, Windham, Vermont
In Britain, you will also find a Londonderry in Yorkshire and one in Worcestershire (have a trawl around:
http://www.gazetteer.co.uk/ ). There are also at least 5 Derry place names in Britain, where Derry is a prefix to the name.
As well as these towns, you also have Derry in Pennsylvania:
http://www.derryborough.org/ In fact, according to
www.multimap,com there are 2 others Derrys in the USA. These are:
1.NEW DERRY, Pennsylvania
2 EAST DERRY, New Hampshire
I would imagine, if your ancestor came from Derry to Scotland, it's more than likely to have been from Derry in Ireland. There was a direct shipping link from Derry to Scotland for many, many years. If that is the confection, it should make your task a lot easier by tracing your ancestor through the Church Parish records and the many societies and groups which assist with genealogy.
What's your ancestor's connection with Derry, Hugo ? If I can assist, I'd be glad to.
Happy searching - John Bradley
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I have just discovered there are several places called Derry. I only knew of the city and the county, both also officially known as Londonderry.
I have an Irish ancestor family who came to Scotland and in one census gave their birthplace as Derry. They were recorded as Donachy.
I have a feeling my headache just got worse!
Hugo