No, there wouldn't be. In the Griffin's Land Valuation (1847-1860s) there were upwards of a thousand hits for Lannan/Lannon/Lannen across Ireland, mainly in counties Wexford, Waterford, Galway, and Leitrim. Leitrim was hit very hard during the Famine years, and most people who survived left for bigger towns, the United States, Canada, or Australia. I've been told that you're more likely to meet people who's family hails from Leitrim outside of Ireland than inside. By 1901 the nation was bouncing back from the potato blight and people from other counties were moving back into the farm lands of Leitrim.
