Leahey vs. Leahey Both spellings appear in our family tree. Possible explanations. Marriage of a Leahey and a Leahy. British brought our family to the Upper Canada (1823) of the day for a very specific reason. Settling disputed lands. War of 1812. Peter Robinson served with distinction in that war. To read Peter Robinson's report. There certainly was a mastery of the Queen's English on his part. The literacy of the day I think was good. Very different family spelling came from their roots in Ireland as would be expected from a much longer settled country. I am pretty certain the settlers knew how to spell their own name and were proud of them. The 1823 expedition was a large scale experiment followed by a larger expedition in 1825. They followed very strict rules of engagement as would be expected from the British. Good luck on your search. James Patrick Leahey.