In 1690, Christopher O'Meighan (the last to hold the title "The O'Meighan") was killed at the Battle of the Boyne. He left 5 sons, 2 of whom (James & Charles)were also under arms in that battles. After the war, those two travelled to France (changing their name from O'Meighan to de Mehegan to accomodate the French tongue). James became a Baron and Governor of LaSalle (Jacques Antoine de Mehegan). His youngest brother William later joined him and became Compte Guillaume de Mehegan. Their lines remained in France for about 100 years until the French Revolution's Reign of Terror. At that time, many fled. Some returned to Ireland - and changed to the spelling "Meighan" - closer to the original spelling. The 3 younger sons (orphaned at the Battle of the Boyne) fled with their mother Margarita (ne O'Reilly) to Tipperary. This branch changed their name to "Meehan". Some family members from various branches have emigrated from Ireland and unfortunately made the search for their records very difficult by changing their spelling to various forms. I've seen Mihan, Meghan, Mehegan, Meegan, Meehan, Meighan, Meighen, and various others.
I would love to re-establish communication with this branch of the family. Please write back, and I will share a great amount of genealogical and historical information on our family.