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origins
Ireland
This Surname started out in Ireland. Here is the correct spelling in Celtic: O' seanain
Scotland
The Shannon Surname also comes from Scotland and can have different spellings in English and Gaelic. Many Scottish Shannons left Scotland for Northern Ireland in the 1600'a and 1700's. Some stayed in Ireland and most went on to the USA. These Scottish Shannons seem to have a different DNA to the southern Irish Shannons. Some of the Shannons of Scottish background did move to Southern Ireland. For example, some seem to have gone to Longford, Dublin and Roscommon. Many of these subsequently emigrated to the USA, Canada and Australia. Actually, the oldest accepted occurrence of the name was from about 1376 in Kirkcudbrightshire, Scotland.